Articles at Alexandrite gemstone buyer and collectors guide http://www.alexandrite.net/chapters/ Consumer Information/Jewelry and Gemstones Copyright 2006-2008 Alexandrite.net http://blogs.law.harvard.edu/tech/rss en-gb Thu, 4 Aug 2016 04:48:45 +0100 info@multicolour.com Thu, 4 Aug 2016 04:48:45 +0100 (pics-1.1 "http://www.icra.org/pics/vocabularyv03" l gen true for "http://alexandrite.net" r (n 0 s 0 v 0 l 0 oa 0 ob 0 oc 0 od 0 oe 0 of 0 og 0 oh 0 c 1) gen true for "http://www.alexandrite.net" r (n 0 s 0 v 0 l 0 oa 0 ob 0 oc 0 od 0 oe 0 of 0 og 0 oh 0 c 1)) webmaster@multicolour.com Jabba 2.0 Glossary of terms that have been discussed or mentioned at Alexandrite gemstone buyer and collectors guide http://www.alexandrite.net/chapters/glossary/index.html http://www.alexandrite.net/viewpage.html?id=GG-016 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:58:52 +0000 Answers to frequently asked questions about alexandrite gemstone identification and value. http://www.alexandrite.net/chapters/faq/index.html http://www.alexandrite.net/viewpage.html?id=GG-012 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 14 Mar 2009 18:00:26 +0000 Guide to synthetic alexandrite production, alexandrite imitations and the differences between natural and synthetic alexandrite http://www.alexandrite.net/chapters/chapter7/index.html http://www.alexandrite.net/viewpage.html?id=GG-009 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:20 +0000 Comprehensive guide for buying and evaluating alexandrite gemstones http://www.alexandrite.net/chapters/chapter9/index.html http://www.alexandrite.net/viewpage.html?id=GG-011 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:23 +0000 An important study of alexandrite origin and the people involved in the discovery and the naming of alexandrite gemstone http://www.alexandrite.net/chapters/chapter2/index.html http://www.alexandrite.net/viewpage.html?id=GG-004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:14 +0000 Collection of myths, legends and lore surrounding the alexandrite gemstone http://www.alexandrite.net/chapters/chapter8/index.html http://www.alexandrite.net/viewpage.html?id=GG-010 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:21 +0000 Study of all the known historical and confirmed alexandrite deposits and mining operations http://www.alexandrite.net/chapters/chapter6/index.html http://www.alexandrite.net/viewpage.html?id=GG-008 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:19 +0000 Chronological history timeline, depicting the history of the alexandrite gemstone and it’s roots http://www.alexandrite.net/chapters/chronology-on-the-history-of-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-014 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:58:51 +0000 History of discovering alexandrite gemstone and the affect it had on the stone's name and the gemstone's value http://www.alexandrite.net/chapters/chapter1/index.html http://www.alexandrite.net/viewpage.html?id=GG-003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:14 +0000 Information about the chrysoberyl mineral, it's properties, varieties and history http://www.alexandrite.net/chapters/chapter3/index.html http://www.alexandrite.net/viewpage.html?id=GG-005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:15 +0000 A comprehensive guide to the chrysoberyl family and it's varieties, including alexandrite and cymophane gemstones http://www.alexandrite.net/chapters/chapter4/index.html http://www.alexandrite.net/viewpage.html?id=GG-006 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:16 +0000 Information about melt and flux techniques used for the synthetic alexandrite manufacturing http://www.alexandrite.net/chapters/chapter7/methods-of-producing-synthetic-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-018 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 08:02:20 +0000 Synthetic alexandrite predominantly used as a laser and was initially developed for military and government applications http://www.alexandrite.net/chapters/chapter7/the-alexandrite-laser.html http://www.alexandrite.net/viewpage.html?id=GG-032 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 08:02:23 +0000 An annotated bibliography of Alexandrite Gemstone Buyer and Collector's Guide http://www.alexandrite.net/chapters/bibliography.html http://www.alexandrite.net/viewpage.html?id=GG-017 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:58:53 +0000 Information about melt, solution growth and vapour deposition techniques used for synthetic gemstones manufacturing http://www.alexandrite.net/chapters/chapter7/synthetic-gemstone-growth-techniques.html http://www.alexandrite.net/viewpage.html?id=GG-019 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 08:02:21 +0000 Discussion about the alexandrite effect as a non-color-constancy phenomenon from the color theory perspective http://www.alexandrite.net/chapters/chapter5/index.html http://www.alexandrite.net/viewpage.html?id=GG-007 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 8 Mar 2009 07:56:17 +0000 http://www.alexandrite.net/chapters/faq/how-can-i-spot-the-difference-between-a-natural-and-a-synthetic-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-0132 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 13:02:11 +0100 It is very unlikely that even an old alexandrite ring could contain a natural alexandrite. Natural alexandrites, especially large clean stones are extremely rare and almost never available at any price. Most old inherited alexandrite rings are actually sy http://www.alexandrite.net/chapters/faq/what-are-the-chances-an-alexandrite-purchased-in-the-50s-is-natural.html http://www.alexandrite.net/viewpage.html?id=GG-0133 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 14 Mar 2009 15:56:03 +0000 Alexandrite gemstone buyer and jewelry collector guide holds information on history, lore, value and properties of the chrysoberyl varieties, including alexandrite and cymophane gemstones. http://www.alexandrite.net/chapters/index.html http://www.alexandrite.net/viewpage.html?id=GG-002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sun, 15 Mar 2009 03:04:25 +0000 First and foremost, we need to look at the quality and strength of the color change. A strong change where the colors are bright and attractive under any kind of light is most desirable. Many stones are either a beautiful green in daylight or a nice pinki http://www.alexandrite.net/chapters/faq/what-do-i-need-to-check-before-purchasing-alexandrite-gemstone.html http://www.alexandrite.net/viewpage.html?id=GG-0139 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 13:02:13 +0100 Several other well known gemstones, including diaspore, sapphire, garnet and spinel may also change color as a function of the light source but the color change of top alexandrites is distinctive and attractive under any light conditions. http://www.alexandrite.net/chapters/faq/are-there-any-other-gemstones-which-change-color.html http://www.alexandrite.net/viewpage.html?id=GG-0125 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:19 +0100 The mining of alexandrite in Russia lasted less than 100 years from the time it was discovered in 1833 to the early 1900’s. It was George Kunz, the gemologist/gemstone buyer for Tiffany & Co that probably did the most to popularize this unique gemst http://www.alexandrite.net/chapters/faq/is-there-a-difference-between-russian-and-brazilian-alexandrite-gemstones.html http://www.alexandrite.net/viewpage.html?id=GG-0120 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 12 Aug 2008 03:41:53 +0100 Although Russian alexandrites have the most historical value, fine stones are occasionally available from deposits in Brazil, India, Tanzania, Madagascar, and Sri Lanka. Unfortunately, there has been little production of alexandrites from any deposit in r http://www.alexandrite.net/chapters/faq/where-do-the-best-alexandrite-gemstones-come-from.html http://www.alexandrite.net/viewpage.html?id=GG-0134 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 13:02:12 +0100 Chrysoberyl is the species name and Alexandrite is the variety name. Alexandrite is that variety of chrysoberyl that changes color as a function of the light source; green in daylight and red under incandescent light. http://www.alexandrite.net/chapters/faq/what-is-the-difference-between-chrysoberyl-and-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-0122 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:18 +0100 Two kinds of light are required to observe color change; daylight and incandescent light? http://www.alexandrite.net/chapters/faq/how-can-i-check-the-color-change-in-an-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-0140 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 14 Mar 2009 15:51:51 +0000 Natural alexandrite is not better than synthetic alexandrite but natural alexandrite is very rare and uncommon in modern jewelry because it is hardly ever available and because it is too expensive for the general public to buy. Even lower quality more inc http://www.alexandrite.net/chapters/faq/why-is-natural-alexandrite-better-than-synthetic-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-0130 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 13:02:10 +0100 An aluminum oxide, it occurs as shapeless grains and masses (emery), rhombohedral crystals. Ruby contains traces of chromium oxide, when red and Fe2O3, which modified the color. The color of sapphire results from a combination of titanium and iron oxides, http://www.alexandrite.net/chapters/glossary/corundum.html http://www.alexandrite.net/viewpage.html?id=GG-088-00009 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:21 +0100 Along with diamonds, rubies, and emeralds, top quality alexandrites are among the most expensive gemstones in the world. In larger sizes over 4.00 or 5.00cts., Burmese rubies are more rare and expensive than alexandrites but in sizes below 1.00cts., alexa http://www.alexandrite.net/chapters/faq/is-alexandrite-the-most-expensive-gemstone-in-the-world.html http://www.alexandrite.net/viewpage.html?id=GG-0129 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:20 +0100 With a hardness of 8.5, Alexandrite is a tough, hard, and durable gemstone that doesn't require any special attention. Still, even the hardest gemstones can shatter with a single well-placed blow so caution is always a good idea. Washing dishes with your http://www.alexandrite.net/chapters/faq/what-is-the-best-way-to-clean-and-take-care-of-alexandrites.html http://www.alexandrite.net/viewpage.html?id=GG-0135 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 13:02:12 +0100 The retail replacement cost for a 1ct. alexandrite could be anywhere between $500 to $12,000 per carat. The intensity of the color change and the attractiveness of the colors are the most important factors in determining the value of an alexandrite. With http://www.alexandrite.net/chapters/faq/how-much-will-a-typical-one-carat-alexandrite-gemstone-cost.html http://www.alexandrite.net/viewpage.html?id=GG-0128 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:20 +0100 Cat's eye is the popular name for an optical effect known as chatoyancy in the gemological nomenclature. Microscopic needle-like inclusions inside the stone reflect a streak of light that appears to open and close as the stone is rotated -- hence the eye http://www.alexandrite.net/chapters/faq/what-is-the-difference-between-cat-s-eye-and-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-0123 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:18 +0100 Unfortunately, most alexandrites show either a nice color in daylight or an attractive color under incandescent light. Rarely are both colors bright and vivid and often stones that change to bright red under incandescent light are only brown or almost bla http://www.alexandrite.net/chapters/faq/what-are-the-most-common-colors-of-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-0127 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:19 +0100 Various birthstone lists have been used in different cultures for thousands of years. http://www.alexandrite.net/chapters/faq/is-the-june-birthstone-pearl-or-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-0137 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 13:02:13 +0100 The most well known gemological laboratories are listed below and all of them are equipped to test alexandrite. Most gemological laboratories only identify gemstones, they do not appraise them. http://www.alexandrite.net/chapters/faq/where-can-i-test-and-appraise-my-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-0138 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 13:02:13 +0100 The cat's-eye effect is caused by the reflection of light off of minute, parallel, needle-like rutile crystals or hollow tubes within the stone. Cat's eye inclusions are aligned parallel to the crystallographic axis and the stones are always cut as caboch http://www.alexandrite.net/chapters/faq/what-causes-the-cat-s-eye-effect-in-chrysoberyl.html http://www.alexandrite.net/viewpage.html?id=GG-0124 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:18 +0100 Alexandrite is an expensive gemstone because it so rare and production has always been limited. For years, the only source for alexandrite was Russia. In the last 20 or 30 years several new discoveries of alexandrite have been reported but production of s http://www.alexandrite.net/chapters/faq/what-makes-natural-alexandrite-so-expensive.html http://www.alexandrite.net/viewpage.html?id=GG-0121 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:17 +0100 Fine alexandrites or alexandrite jewelry can be purchased from jewelers specializing in colored gemstones, at trade shows, from TV sellers, at high end jewelry auctions, or online from websites specialized in alexandrite. You would be unlikely to find a h http://www.alexandrite.net/chapters/faq/where-can-i-buy-natural-alexandrite-gemstones.html http://www.alexandrite.net/viewpage.html?id=GG-0136 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 13:02:12 +0100 Any array of electromagnetic visible light ordered according to its constituent wavelengths or colors, when the white light is dispersed by a prism or diffraction grating, ranging from about 750 to about 400 nm. The spectra can obtained by means of spectr http://www.alexandrite.net/chapters/glossary/spectrum.html http://www.alexandrite.net/viewpage.html?id=GG-104-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:02 +0100 Alexandrite is a trichroic gemstone which absorbs and reflects light differently in each of its three optical directions. Spectroscopic analysis reveals a different absorption spectrum for each of the three optical directions. The differences in absorptio http://www.alexandrite.net/chapters/faq/why-does-alexandrite-appear-to-change-color-in-sunlight-and-artificial-light.html http://www.alexandrite.net/viewpage.html?id=GG-0126 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 29 Jul 2008 12:59:19 +0100 A hard, important gem mineral, of which alexandrite and cymophane are two varieties. Occasionally a greenish chatoyancy can be seen which was formerly known as cymophane, but is now called chrysoberyl cat's eye, or oriental cat's eye, when cut en cabochon http://www.alexandrite.net/chapters/glossary/chrysoberyl.html http://www.alexandrite.net/viewpage.html?id=GG-088-00006 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:19 +0100 There are four major methods of changing the colors of gemstones. These are surface painting or foiling the back, oiling, coating, impregnating, staining of porous stones, heat treatment, and irradiation by particles of atomic size and X-rays. The color c http://www.alexandrite.net/chapters/glossary/color-change.html http://www.alexandrite.net/viewpage.html?id=GG-088-00008 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:21 +0100 An isomorphous mineral of spinel group. A wide range of colors and shade of gemstone. Red-orange is named as flame spinel, an iron-rich dark-green to black, which is known as green spinel, pleonaste or ceylonite, grass-green as chlorospinel (iron-rich), b http://www.alexandrite.net/chapters/glossary/spinel.html http://www.alexandrite.net/viewpage.html?id=GG-104-00006 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:02 +0100 An optical effect, possessed by certain translucent gemstones in reflecting light, in which a movable, wavy or silky sheen is concentrated in a narrow band of white light that changes its position, when the gem is turned. This is a characterized of cat's http://www.alexandrite.net/chapters/glossary/chatoyancy.html http://www.alexandrite.net/viewpage.html?id=GG-088-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:18 +0100 A general name for any small visible foreign matter such as gas, liquid, glass, or mineral enclosed within a gemstone or rock, which is a growth phenomena. Fracture or cleavage in a gemstone are not classed as inclusions. The nature of inclusions are used http://www.alexandrite.net/chapters/glossary/inclusions.html http://www.alexandrite.net/viewpage.html?id=GG-094-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:06 +0100 An isometric mineral, representing a naturally occurring crystalline form of pure carbon polymorphous with graphite, chaoite, and lonsdaleite and being the hardest substance known. Found in volcanic neck, volcanic pipe, and alluvial deposits. Cut into var http://www.alexandrite.net/chapters/glossary/diamond.html http://www.alexandrite.net/viewpage.html?id=GG-089-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:25 +0100 A unit employed in weighing diamonds, pearls, and other gemstones, which formerly ranged from 185.5 to 205.3 milligrams. Now the International metric carat is equal to 0.2 gram, or 200 milligrams and this is the standard in a majority of countries. Abbrev http://www.alexandrite.net/chapters/glossary/carat.html http://www.alexandrite.net/viewpage.html?id=GG-088-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:17 +0100 In crystal optics, a number indicating the speed of the velocity of light in a vacuum or air to its velocity in a given crystal. The refractive index (RI) of a crystal can be expressed as ratio of the sine of the angle of incidence to the sine of the angl http://www.alexandrite.net/chapters/glossary/index-of-refraction.html http://www.alexandrite.net/viewpage.html?id=GG-094-00006 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:05 +0100 The emission of light by a substance due to high temperatures: white or bright-red heat. When objects such as iron placed in fire it become dull red by 700 C degree. From 700 C degree to 1500 C degree, the color shifted from red to orange and definitely y http://www.alexandrite.net/chapters/glossary/incandescence.html http://www.alexandrite.net/viewpage.html?id=GG-094-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:06 +0100 The emission of certain visible wavelengths of light from a substance other than thermal process, which are used as diagnostic determination of gemstones. It is caused by the emission of photons, when an exited atom within the substance returns to the gro http://www.alexandrite.net/chapters/glossary/luminescence.html http://www.alexandrite.net/viewpage.html?id=GG-097-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:45 +0100 Alexandrite cannot be improved by any kind of thermal treatment. Although some have tried, heat treatment does not seem to affect alexandrite at all. Some lower quality cracked alexandrites are oiled to hide the cracks but beyond that, alexandrite is not http://www.alexandrite.net/chapters/faq/are-there-any-ways-to-improve-alexandrite-colors-by-any-special-treatment-like-heating.html http://www.alexandrite.net/viewpage.html?id=GG-0131 info@multicolour.com Consumer Information/Jewelry and Gemstones Tue, 12 Aug 2008 03:44:56 +0100 Any rough mineral or other material natural or synthetic, which possesses the necessary attractiveness, brilliance, beauty, rarity, color dispersion, refraction, color or colorless, flawless, portability, fashionably, and durability for use in gem industr http://www.alexandrite.net/chapters/glossary/gemstone.html http://www.alexandrite.net/viewpage.html?id=GG-092-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:30 +0100 The process of exposing certain diamond or other pale or poorly colored gemstone to radiation, such as in nuclear reactor, X-rays, neutrons from an atomic pile, deuterons a nucleus of the heavy hydrogen atom, gamma rays from a cobalt-60, electrons positiv http://www.alexandrite.net/chapters/glossary/irradiation.html http://www.alexandrite.net/viewpage.html?id=GG-094-00007 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:05 +0100 An acronym of light amplification by stimulated emission of radiation. A device that emits UV to infra red electromagnetic energy, that is a nearly parallel, nearly monochromatic and coherent beam of light of very restricted diameter formed by causing exi http://www.alexandrite.net/chapters/glossary/laser.html http://www.alexandrite.net/viewpage.html?id=GG-097-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:44 +0100 An unfaceted, highly polished, cut gemstone, in which the top of the gem forms a dome-shaped or curved, convex surface. The base may be flat, convex or concave. The girdle outline may be round, oval, square, triangular, polygonal, or any other fancy shape http://www.alexandrite.net/chapters/glossary/cabochon.html http://www.alexandrite.net/viewpage.html?id=GG-088-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:17 +0100 Named after Russian Tsar Alexander II. A highly dichroic, rare variety of chrysoberyl. Emerald green in natural daylight, reddish in violet by artificial light, due to its unusual absorption properties. One of the hardest and most important gemstones. A f http://www.alexandrite.net/chapters/glossary/alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-086-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:09 +0100 Quantum of light or electromagnetic radiation, it can behave as a wave or as a particle. Traveling at the velocity of light. Photon have momentum but not mass or electrical charge. Also known as light quantum. Caused by excitation of atoms and molecules a http://www.alexandrite.net/chapters/glossary/quantum.html http://www.alexandrite.net/viewpage.html?id=GG-102-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:51 +0100 The science of high temperature of one subject to change its color, because by increasing of temperature expands the bond length of lattice, reduced the ligand field. A red compound of 10% Cr2O3 and 90% Al2O3 by increasing the temperature to over 400 C th http://www.alexandrite.net/chapters/glossary/thermochroism.html http://www.alexandrite.net/viewpage.html?id=GG-105-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:04 +0100 Artificially made substance that has the same appearance, physical properties and chemical compound as its natural counterpart mineral. Some synthetic stones have no counterpart in nature they are synthetic gemstones except if they used as an imitation fo http://www.alexandrite.net/chapters/glossary/synthetic.html http://www.alexandrite.net/viewpage.html?id=GG-104-00007 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:03 +0100 A device for cleaning dirt and other foreign particles from gemstones and jewelry articles by subjecting them to ultrasonic vibrations immersed in water or other solvent. The articles must be free of stress flaws. Glass lenses and other bodies can be poli http://www.alexandrite.net/chapters/glossary/ultrasonic-cleaning.html http://www.alexandrite.net/viewpage.html?id=GG-080-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:30 +0100 To result something of a genuine article or natural gemstone or simulate it from any material that imitate by its color, the appearance of a natural gemstone. Imitation gemstone having wholly different physical properties and chemical composition, and hen http://www.alexandrite.net/chapters/glossary/imitation.html http://www.alexandrite.net/viewpage.html?id=GG-094-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:08 +0100 The turning back of wave from surface, on which they are incident according to the definite law of reflection. A small part of ray 17.2% of incident light striking the surface vertically is reflected from the surface (the 17.2% is upper limit of reflected http://www.alexandrite.net/chapters/glossary/reflection.html http://www.alexandrite.net/viewpage.html?id=GG-103-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:57 +0100 Dioxide of silicon (SiO2), which appeared in five crystalline polymorphous such as quartz (alpha and beta), tridymite, cristobalite, coesite, and stichovite, in cryptocrystalline such as chalcedony and chert, and in amorphous such as opal (a hydrated sili http://www.alexandrite.net/chapters/glossary/silica.html http://www.alexandrite.net/viewpage.html?id=GG-104-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:58 +0100 This is a technique used to make certain synthetic gemstones such as emerald, ruby, spinel, quartz, Alexandrite, YAG, etc., man-made crystals growing in a high melting solvent or flux. The material or composition of desired synthetic crystal (beryllium an http://www.alexandrite.net/chapters/glossary/flux-fusion-method.html http://www.alexandrite.net/viewpage.html?id=GG-091-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:29 +0100 A mercury discharched lamp in quartz glass designed to produce ultraviolet light for exciting luminescence in gem minerals specially diamonds. The long-wave lamp is provided with wood's glass filter to emit wavelengths between 400 nm and 300 nm. To obtain http://www.alexandrite.net/chapters/glossary/ultraviolet-lamp.html http://www.alexandrite.net/viewpage.html?id=GG-080-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:31 +0100 If a crystal is irradiated by an intense X-ray or gamma-ray beam, this includes the substance to emit its visible characteristic secondary X-ray line spectra of a longer wavelength, which is known as X-ray fluorescence. It is a nondestructive method. Used http://www.alexandrite.net/chapters/glossary/x-ray-fluorescence.html http://www.alexandrite.net/viewpage.html?id=GG-083-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:37 +0100 Any rock, which has been derived from pre-existing rocks by mineralogical, chemical composition, textural and structural changing, essentially in the solid state due to processes operating in the earth's crust of heat or intense pressure, shearing stress, http://www.alexandrite.net/chapters/glossary/metamorphic-rock.html http://www.alexandrite.net/viewpage.html?id=GG-098-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:47 +0100 The quality of resistance or property of minerals, gemstones, etc., which is determined by reference to an empirical scale of standard of minerals. Hardness is the resistance of a mineral offered to abrasion or scratching (scelerometric). The absolute har http://www.alexandrite.net/chapters/glossary/hardness.html http://www.alexandrite.net/viewpage.html?id=GG-093-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:32 +0100 To simulate or imitate a natural gemstone, which is made from components that are easier, cheaper or more convenient to manufacture. Simulated stone having superficial appearance to the true stone but differs from it either in chemical composition, struct http://www.alexandrite.net/chapters/glossary/simulant.html http://www.alexandrite.net/viewpage.html?id=GG-104-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:00 +0100 The emission of particles or electromagnetic waves from a source such as nuclear radiation, X-rays, neutrons, gamma rays, electrons positive or negative, protons. Radiation has the effect of artificially altering color by artificially creating color cent http://www.alexandrite.net/chapters/glossary/radiation.html http://www.alexandrite.net/viewpage.html?id=GG-103-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:56 +0100 A loose and inexact term that may be to define: usually homogeneous inorganic substance of definite physical properties and more or less chemical composition, which occur naturally in the earth, and usually possess a crystalline structure, which frequentl http://www.alexandrite.net/chapters/glossary/mineral.html http://www.alexandrite.net/viewpage.html?id=GG-098-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:34 +0100 A common rock-forming rhombohedral mineral from carbonate group, which is used for large objects. It is prized by collectors. Massive variety misnomerly known as dolomite marble. Banded material in red, yellow, green brown, and white from north America is http://www.alexandrite.net/chapters/glossary/dolomite.html http://www.alexandrite.net/viewpage.html?id=GG-089-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:25 +0100 A variety of luminescence. Certain materials display an effect of producing visible electromagnetic light, when irradiated by ultraviolet light, cathode ray or X-rays, or other forms of radiation of an appropriate wavelength. The emitted light has another http://www.alexandrite.net/chapters/glossary/fluorescence.html http://www.alexandrite.net/viewpage.html?id=GG-091-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:28 +0100 A grayish-white, hard, brittle, non-corrosive metallic element in the Group VIB of the Periodic System, obtained from chromite. One of the eight metallic elements, mainly responsible for green or red color in very important gem minerals such as emerald, r http://www.alexandrite.net/chapters/glossary/chromium.html http://www.alexandrite.net/viewpage.html?id=GG-088-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:19 +0100 The chrysoberyl crystal is penetrated by microscopic tubes, two-phase or relatively short needles parallel to the vertical or c-axis of the crystal, suitable for cut en cabochon. In brown and yellow varieties can be seen. The so-called stepped twin planes http://www.alexandrite.net/chapters/glossary/inclusion-in-chrysoberyl.html http://www.alexandrite.net/viewpage.html?id=GG-094-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:06 +0100 An isomorphous group of minerals with general formula 8[A3B2(SiO4)3]. Cubic system. Mainly dodecahedral or tetragonal trioctahedral crystals. Vitreous to resinous luster. No cleavage. Conchoidal to uneven fracture. Brittle to tough. Garnets are divided in http://www.alexandrite.net/chapters/glossary/garnets.html http://www.alexandrite.net/viewpage.html?id=GG-092-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:30 +0100 A method of growing synthetic crystal by high-melting point devised by Czochralski and is named as Czochralski pulling technique. Where a seed crystal is gently lowered until it is in contrast with pure melt in the crucible and it is then pulled slowly up http://www.alexandrite.net/chapters/glossary/czochralski-technique.html http://www.alexandrite.net/viewpage.html?id=GG-088-00015 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:23 +0100 A small hand optical device for obtaining and visually observing spectrum, in which collimated light passes through a narrow slit onto either a prism or diffraction grating, its spectrum being viewed by a lens system or telescope. The angle between the c http://www.alexandrite.net/chapters/glossary/spectroscope.html http://www.alexandrite.net/viewpage.html?id=GG-104-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:02 +0100 A miniature cathode ray tube (CRT), which is closet to cover glass and heated cathode made of tungsten wire emits electrons. The electrons are accelerated by positively charged by hexagonal steel and passing through the grid to anodes covered with blue fl http://www.alexandrite.net/chapters/glossary/vacuum-fluorescence-display.html http://www.alexandrite.net/viewpage.html?id=GG-081-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:32 +0100 A variety of luminescence where certain rocks of minerals showing the property due to application of heat or infrared. Some diamonds exhibits blue thermoluminescence, when heated to about 200 C. Thermoluminescence emitted when the color traps are disappea http://www.alexandrite.net/chapters/glossary/thermolumnescence.html http://www.alexandrite.net/viewpage.html?id=GG-105-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:04 +0100 The classification of fashioned gemstones or diamonds according to their clarity using the standard nomenclature of terms: flawless, pure, clean, perfect (for top grade). VVS (very very slightly included), VS (very slightly included), SI (slightly include http://www.alexandrite.net/chapters/glossary/clarity-grading.html http://www.alexandrite.net/viewpage.html?id=GG-088-00007 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:20 +0100 Testing a gemstone on a refractometer prism, when the stone has a greater refractive index than the measuring prism of the device, or higher than the refractive index of immersion liquid used for optical contact, the scale of refractometer remains dark an http://www.alexandrite.net/chapters/glossary/negative-reading.html http://www.alexandrite.net/viewpage.html?id=GG-099-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:41 +0100 A solid volcanic natural form of glass (rock) produced by sudden cooling and solidification of viscous lava before crystallization can take place, such as obsidian, pitchstone or other glassy masses. Obsidian is used for tumbled gems, ornamental objects, http://www.alexandrite.net/chapters/glossary/volcanic-glass.html http://www.alexandrite.net/viewpage.html?id=GG-081-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:33 +0100 A very hard, light-gray, ductile, malleable, metallic element of the group V of the Periodic System with the symbol V. It is one of the 8 pigment metals responsible for color in gemstones such as beryl, sapphire (natural or synthetic). Used as a component http://www.alexandrite.net/chapters/glossary/vanadium.html http://www.alexandrite.net/viewpage.html?id=GG-081-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:32 +0100 The degree of ability of a gemstone to withstand the effects of abrasion, scratching, impact, and chemical action, etc. The durability of a gemstone depends on chemical composition and both of its hardness and toughness. A mineral may be quite tough but r http://www.alexandrite.net/chapters/glossary/durability.html http://www.alexandrite.net/viewpage.html?id=GG-089-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:25 +0100 An unusual feature occur in Verneuil synthetic corundum by plunging of still heated stone into a much cooler liquid (thermal shock), which create fractures and it resemble closely to natural stone. By pursuing of this process developed honeycomb pattern d http://www.alexandrite.net/chapters/glossary/quench-crackled-synthetic-corundum.html http://www.alexandrite.net/viewpage.html?id=GG-102-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:54 +0100 To generate monochromatic X-rays or line spectrums only one wavelength used is a suitable selective filter made of very thin layers of metal elements. There have one or two atomic numbers lower than the target metal such as nickel with atomic number 28 us http://www.alexandrite.net/chapters/glossary/x-ray-filters.html http://www.alexandrite.net/viewpage.html?id=GG-083-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:36 +0100 The four quadrilateral facets of 8 main facets on the crown or on the pavilion of a brilliant-cut stone, which are also called bezel facets. The 4 on the crown touching the girdle with their apex and extending up to touch the table. There are four lozenge http://www.alexandrite.net/chapters/glossary/quoin-facets.html http://www.alexandrite.net/viewpage.html?id=GG-102-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:55 +0100 In metallurgy a unit that expresses only to the purity of solid gold used in jewelry. In trade based on a scale of twenty-fourths, 24 karat means pure gold, 18 karat gold means, containing 18 parts gold to 6 parts of alloy, and 9 karat gold means, contain http://www.alexandrite.net/chapters/glossary/karat.html http://www.alexandrite.net/viewpage.html?id=GG-096-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:46 +0100 A special magnifying device for investigating the objects are illuminated by ultraviolet light in the range 180 to 400 nm. The resolving power is increased corresponding to the resolution of shorter wavelengths than visible light. It requires special quar http://www.alexandrite.net/chapters/glossary/ultraviolet-microscope.html http://www.alexandrite.net/viewpage.html?id=GG-080-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:32 +0100 A variety of translucent, grayish-green to greenish yellow chatoyant quartz or chalcedony containing fine parallel fibers of asbestos or parallel channels, arranged through the stone at right angles to the eye and parallel to the base of the crystal, that http://www.alexandrite.net/chapters/glossary/quartz-cat-s-eye.html http://www.alexandrite.net/viewpage.html?id=GG-102-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:52 +0100 Indian gem lore was from ancient times famous for its good quality and richness. There are several famous gems in other museums such as Timur Ruby, Koh-i-Nur Diamond, etc. Most famous part of Indian jewels was in possession oh Maharajah Duleep Singh. http://www.alexandrite.net/chapters/glossary/jewels-of-india.html http://www.alexandrite.net/viewpage.html?id=GG-095-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:27 +0100 When ultraviolet light transmit through a colored gemstone, due to colored sample certain wavelengths are absorbed more strongly than others. When the spectrum is passed through the medium into a testing spectroscope, the colors most strongly absorbed may http://www.alexandrite.net/chapters/glossary/ultraviolet-absorption.html http://www.alexandrite.net/viewpage.html?id=GG-080-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:31 +0100 A powerful optical instrument, which uses a stream of electrons or X-ray radiation instead of light focused by electron lenses to throw shadows of opaque object on a fluorescent viewing screen or photographic plate in a manner similar to that, in which a http://www.alexandrite.net/chapters/glossary/electron-microscope.html http://www.alexandrite.net/viewpage.html?id=GG-090-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:26 +0100 A light-colored, coarse-grained igneous rock from granite clan containing orthoclase, quartz, microline, mica, gemstones, and many ferromagnesian minerals resulting from slow solidification. Pegmatite is occurring place of many uncommon gem minerals such http://www.alexandrite.net/chapters/glossary/pegmatite.html http://www.alexandrite.net/viewpage.html?id=GG-101-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:38 +0100 A regular polyhedral solid form of a definite internal atomic structure, bounded by natural plane surfaces. This definite arrangement directly influences the physical and optical properties. Crystals are classified into seven systems according to the symm http://www.alexandrite.net/chapters/glossary/crystal.html http://www.alexandrite.net/viewpage.html?id=GG-088-00010 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:21 +0100 The straight, parallel growth-lines in the internal structure of a gemstone with definite angles, usually seen in some stones, which occur by slightly variation in the chemical composition within the crystal due to separation or interruptions of the cryst http://www.alexandrite.net/chapters/glossary/zoning.html http://www.alexandrite.net/viewpage.html?id=GG-085-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:42 +0100 A natural geological description for disintegration and decomposition of rocks and minerals as consequent exposure to atmospheric agents at or near the Earth's surface such as chemical action of air, rainwater, frost, insolation, bacteria, plants, and mec http://www.alexandrite.net/chapters/glossary/weathering.html http://www.alexandrite.net/viewpage.html?id=GG-082-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:36 +0100 In each crystal class there is a form, in which the faces, of which intersect all of the crystallographic axes at different lengths with the symbol {hkl}. In the orthorhombic, monoclinic, and triclinic crystal system {111} is a general form. All other for http://www.alexandrite.net/chapters/glossary/general-form.html http://www.alexandrite.net/viewpage.html?id=GG-092-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:31 +0100 An oily colorless, specific odor, insoluble, basic heterocyclic with the formula C9H7N. Composed synthetically by heating aniline, nitrobenzene, glycerol, and sulfuric acid. Used as food preservative and in the manufacture of dyes and antiseptics. R.I. - http://www.alexandrite.net/chapters/glossary/quinoline.html http://www.alexandrite.net/viewpage.html?id=GG-102-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:55 +0100 A misleading term for synthetic spinel or corundum (sapphire), which is able to change color like alexandrite reddish-green in daylight and reddish at artificially light, such stones were at first misnomered as scientific alexandrite. Synthetic sapphire http://www.alexandrite.net/chapters/glossary/synthetic-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-104-00008 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:03 +0100 A gemstone that has been associated, by superstitions and religious tradition as appropriate to the time or month of one's birth. There are also birthstones for days, hours, signs of the zodiac, and seasons. Also called natal-stone. http://www.alexandrite.net/chapters/glossary/birthstone.html http://www.alexandrite.net/viewpage.html?id=GG-087-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:15 +0100 Physical properties of gemstones are extremely important in understanding geological phenomena in synthesizing new materials, and identification of minerals. Physical properties and chemical composition of minerals change with temperature and pressure. P http://www.alexandrite.net/chapters/glossary/physical-properties.html http://www.alexandrite.net/viewpage.html?id=GG-101-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:48 +0100 Yellow greenish to light yellow or brown chrysoberyl, which contains ferric iron as an impurity. Has an absorption spectrum band at first part of the violet at 444 nm, which can be seen in some chrysoberyl cat's-eye. http://www.alexandrite.net/chapters/glossary/yellow-chrysoberyl.html http://www.alexandrite.net/viewpage.html?id=GG-084-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:39 +0100 A device to obtain an X-ray spectrum for determining the wavelength of its chemical consistent. Each element, when irradiated by electrons, emits X-ray of several characteristic frequencies the line spectrum depending on the atomic number. http://www.alexandrite.net/chapters/glossary/x-ray-crystal-spectrometer.html http://www.alexandrite.net/viewpage.html?id=GG-083-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:35 +0100 A naturally occurring molten or semi-molten material in suspension, with dissolved gases, generated within or beneath the earth's crust and capable of intrusion and extrusion. Magma, which is extruded on the surface of the earth is called lava. http://www.alexandrite.net/chapters/glossary/magma.html http://www.alexandrite.net/viewpage.html?id=GG-098-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:04 +0100 The ratio of the weight of any substance to that of pure water at temperature of 3.98 C (39.2 F) degree and standard atmospheric pressure. Specific gravity of gems and minerals are determined by means by hydrostatic weighing method. http://www.alexandrite.net/chapters/glossary/specific-gravity.html http://www.alexandrite.net/viewpage.html?id=GG-104-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:01 +0100 The produced wavelengths of X-rays according to the electromagnetic theory of light consisting of continuous band of wavelengths, which are a mixture of all wavelengths. Depends on the used voltage of apparatus, which is know as white X-ray radiation or g http://www.alexandrite.net/chapters/glossary/x-ray.html http://www.alexandrite.net/viewpage.html?id=GG-083-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:36 +0100 The characteristic color that is determined by its wavelength as red, green, blue, purple, yellow, etc., and excludes white, black, and shades of gray in reference to the visible spectrum of light. http://www.alexandrite.net/chapters/glossary/hue.html http://www.alexandrite.net/viewpage.html?id=GG-093-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:08 +0100 In optics, the reduction of the light intensity in transmission through an absorbing substance or in reflection from a surface, in crystals, minerals and gems. Absorption may vary with wavelengths of vibration in the direction of the transmitted light or http://www.alexandrite.net/chapters/glossary/light-absorption.html http://www.alexandrite.net/viewpage.html?id=GG-097-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:44 +0100 The distance between two points having the same phase on the following or preceding wave. The wavelength of electromagnetic radiation is equal to the velocity of the wave divided by its frequency =c/v. It is measured in nanometers unit. http://www.alexandrite.net/chapters/glossary/wavelength.html http://www.alexandrite.net/viewpage.html?id=GG-082-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:35 +0100 A transparent to semitransparent, cyclo-silicate mineral species. Varieties of beryl are emerald, aquamarine, heliodor or golden beryl, bixbite, goshenite, maxixe, and morganite. Rare spelling: berylline. Sometimes showing chatoyancy and exhibiting star e http://www.alexandrite.net/chapters/glossary/beryl.html http://www.alexandrite.net/viewpage.html?id=GG-087-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:14 +0100 The theory that the eye contains three different groups of retinal fibers (cones) with maximum response to three primary colors to red-yellow, green, and blue violet, which are parts of the spectrum. http://www.alexandrite.net/chapters/glossary/young-helmholtz-theory-of-color-vision.html http://www.alexandrite.net/viewpage.html?id=GG-084-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:39 +0100 Several characteristic lines of the spectrum of X-ray, which are emitted by a bombardment of material with electrons such as curved dark lines on the films produced by X-ray method of powder diffraction of stone or minerals. http://www.alexandrite.net/chapters/glossary/x-ray-spectrum.html http://www.alexandrite.net/viewpage.html?id=GG-083-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:37 +0100 Generally a fine crystalline or glassy igneous rock, which is formed by the solidification of molten magma or lava on the Earth's surface during volcanic action. Such as basalt, obsidian, etc. http://www.alexandrite.net/chapters/glossary/volcanic-rock.html http://www.alexandrite.net/viewpage.html?id=GG-081-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:33 +0100 Repeated twining that tends to produce circular forms according to the same twin law but with the twin axis or twin planes, such as chrysoberyl or aragonite crystals having a pseudohexagonal symmetry. http://www.alexandrite.net/chapters/glossary/cyclic-twins.html http://www.alexandrite.net/viewpage.html?id=GG-088-00012 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:22 +0100 The most commonly used ten standard scale of relative hardness of minerals. The scale is expressed in numbers ranging from 1 through 10: (1) talc, (2) gypsum, (3) calcite, (4) fluorite, (5) apatite, (6) orthoclase, (7) quartz, (8) topaz, (9) corundum, (10 http://www.alexandrite.net/chapters/glossary/moh-s-hardness-scale.html http://www.alexandrite.net/viewpage.html?id=GG-098-00007 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:34 +0100 An artificial gem comprised of lithium aluminum silicate and made in a variety of colors. Neodymium as a coloring agents yields pink lavender colors. A vivid, laser blue variety blue is colored by copper. http://www.alexandrite.net/chapters/glossary/alexandrium.html http://www.alexandrite.net/viewpage.html?id=GG-086-00009 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:13 +0100 Any gemstone that has been heated to change its color or improve the color, such as blue zircon, hyacinth, burnt amethyst, white chalcedony, smoky quartz and many aquamarines. http://www.alexandrite.net/chapters/glossary/heated-stone.html http://www.alexandrite.net/viewpage.html?id=GG-093-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:32 +0100 A gemstone permits the pass of electromagnetic radiation through it without distortion so that the object can be seen clearly and distinctive through it, such a quartz crystal. It is a see through effects. http://www.alexandrite.net/chapters/glossary/transparent.html http://www.alexandrite.net/viewpage.html?id=GG-105-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:29 +0100 A dark gray, silvery luster, rare earth metallic element of the Periodic System with the symbol Y. Flammable when powder from. Used in alloys and as a metal deoxidizer. http://www.alexandrite.net/chapters/glossary/yttrium.html http://www.alexandrite.net/viewpage.html?id=GG-084-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:40 +0100 The weight (mass) of a substance per unit volume at a stated temperature, measured in kilograms per cubic meter, Kg/m3 or gm/cm3. The comparison of the weight of a given space of a gemstone with the weight of a similar space of another gem. http://www.alexandrite.net/chapters/glossary/density.html http://www.alexandrite.net/viewpage.html?id=GG-089-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:24 +0100 Inclusions, which are produce by hydrothermal synthetic emeralds by presence of wispy or veillike groups, manufactured by Chatham, Gilson, and Zerfass. That is an unmistakable characteristic of flux-fusion or flux-melt method. http://www.alexandrite.net/chapters/glossary/flux-inclusions.html http://www.alexandrite.net/viewpage.html?id=GG-091-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:28 +0100 Minerals having a high specific gravity, which are separated in the laboratory from light minerals by use of heavy liquid, such as bromoform. Generally grains heavier than bromoform constitute the heavy minerals. http://www.alexandrite.net/chapters/glossary/heavy-minerals.html http://www.alexandrite.net/viewpage.html?id=GG-093-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:32 +0100 A colorless glass-like material used as an impregnation or filling agent to improve the appearance and reduce the visibility of inclusions in stones such as diamonds and emeralds. http://www.alexandrite.net/chapters/glossary/yehuda-treatment.html http://www.alexandrite.net/viewpage.html?id=GG-084-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:38 +0100 A light, silver-white, ductile, malleable metal, with a high electrical conductivity and good resistance to corrosion. Its chemical symbol is Al. Used in jewelry, for costume jewelry and junk jewelry. http://www.alexandrite.net/chapters/glossary/aluminum.html http://www.alexandrite.net/viewpage.html?id=GG-086-00010 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:14 +0100 A thin needle-shaped or acicular crystal, which is an inclusions in certain minerals, such as rutilated quartz, sapphire, or corundum. Sometimes actinolite, goethite, etc. appear in certain crystals. http://www.alexandrite.net/chapters/glossary/needle.html http://www.alexandrite.net/viewpage.html?id=GG-099-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:33 +0100 The sum of homogeneous, physically distinct portion of matter in heterogeneous system, as the three phases; solid, liquid, or gas. Each phase may exist in different temperatures and pressures. http://www.alexandrite.net/chapters/glossary/phase.html http://www.alexandrite.net/viewpage.html?id=GG-101-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:37 +0100 A special optical occurrence, or circumstance observed or are visible in certain gemstones such as chatoyancy, asterism, or play of color, adularescence, girasol, labradorescence, opalescence, schiller, etc. http://www.alexandrite.net/chapters/glossary/phenomenon.html http://www.alexandrite.net/viewpage.html?id=GG-101-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:37 +0100 Several methods are available for the measurement of refractive indices such as refractometer for total reflection, immersion method in liquid for Beck effect, shadow method, and minimum deviation method. http://www.alexandrite.net/chapters/glossary/refractive-index-measurement.html http://www.alexandrite.net/viewpage.html?id=GG-103-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:58 +0100 A number of decorative articles made artistically of gold, platinum, silver, and precious stones that are worn for personal adornment, such as bracelets, rings, necklaces, etc. http://www.alexandrite.net/chapters/glossary/jewelry.html http://www.alexandrite.net/viewpage.html?id=GG-095-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:27 +0100 Prized by collectors. Synthetic strontium titanate or fabulite found in a similar manner to perovskite. Natural counterpart of fabulite with the same composition is called tausonite. http://www.alexandrite.net/chapters/glossary/perovskite.html http://www.alexandrite.net/viewpage.html?id=GG-101-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:38 +0100 Zonary growing of crystals bounded by plane crystal faces, which occur by slight variation in the composition of a crystal due to separation or interruptions of the crystal phases during growth. http://www.alexandrite.net/chapters/glossary/zonary-growth.html http://www.alexandrite.net/viewpage.html?id=GG-085-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:40 +0100 Gemstone transmits light but no object can be seen clearly through it such as moonstone. Translucent gemstones are not suitable for brilliant cutting but cut cabochon. http://www.alexandrite.net/chapters/glossary/translucent.html http://www.alexandrite.net/viewpage.html?id=GG-105-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:07 +0100 A subsidiary company of the Gemological Institute of America Enterprises, which provides professional grading and identification for the diamond and colored stone industries. http://www.alexandrite.net/chapters/glossary/gia-gem-trade-laboratory.html http://www.alexandrite.net/viewpage.html?id=GG-092-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:31 +0100 A rock or mineral in plate form consisting of several different layers bonded by or cemented together, which is separated or split into thin layers. http://www.alexandrite.net/chapters/glossary/laminate.html http://www.alexandrite.net/viewpage.html?id=GG-097-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:43 +0100 Radium treatment of minerals such as beryl to produce a bluish-white fluorescence only on the basal planes. Under SWUV and LWUV light beryl fluoresces bluish-white. http://www.alexandrite.net/chapters/glossary/radium-fluorescence.html http://www.alexandrite.net/viewpage.html?id=GG-103-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:56 +0100 Synthetic alexandrite made in three methods in Russia, (a) growing synthetic stones of solution-growth process or flux process specially for alexandrite, (b) Growing stone of floating-zone process. (c) Melt-grown process or so-called pulling method. http://www.alexandrite.net/chapters/glossary/novosibirsk-synthetic-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-099-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:41 +0100 A type of igneous rock characterized by a high content of mafic minerals, particularly olivine, pyroxenes, amphiboles, etc. The silica content is less than 45%. http://www.alexandrite.net/chapters/glossary/ultramafic.html http://www.alexandrite.net/viewpage.html?id=GG-080-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:30 +0100 A standard mass. The unit of weight of gemstones since 1913, is the international metric carat or decimally of them in points. http://www.alexandrite.net/chapters/glossary/weight-of-gemstones-and-precious-metals.html http://www.alexandrite.net/viewpage.html?id=GG-082-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:36 +0100 Any forms or styles used in the fashioning of gemstones such as antique cut, brilliant cut, emerald cut, baguette, cabochon, rose cut, etc. http://www.alexandrite.net/chapters/glossary/gemstone-cuts.html http://www.alexandrite.net/viewpage.html?id=GG-092-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:31 +0100 A steely, uncorrodible, white metallic element, in the group II of the Periodic System, with the chemical symbol Be. Used as an alloy. http://www.alexandrite.net/chapters/glossary/beryllium.html http://www.alexandrite.net/viewpage.html?id=GG-087-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:15 +0100 A term applied to a polished plane-geometrical surface of a cut diamond or other gemstone of various shapes and sizes. In French spelled facette. http://www.alexandrite.net/chapters/glossary/facet.html http://www.alexandrite.net/viewpage.html?id=GG-091-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:28 +0100 The placing of atoms or radicals in a crystal so that they point in a definite direction, or its crystallographic axes are in the conventional position. http://www.alexandrite.net/chapters/glossary/orientation-crystal.html http://www.alexandrite.net/viewpage.html?id=GG-100-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:39 +0100 Water molecules, which have been chemically combined in certain crystals or hydrated salts, which are given off when the crystals are heated. http://www.alexandrite.net/chapters/glossary/water-of-crystallization.html http://www.alexandrite.net/viewpage.html?id=GG-082-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:34 +0100 A term used in crystallography to the direction of an anisotropic crystal along which there are no double reflection. http://www.alexandrite.net/chapters/glossary/optical-axis.html http://www.alexandrite.net/viewpage.html?id=GG-100-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:40 +0100 Any lens or combination of lenses acting virtually as a magnifying lens in a microscope nearest the eye of the observer. Also called ocular, or ocular lens. http://www.alexandrite.net/chapters/glossary/eyepiece.html http://www.alexandrite.net/viewpage.html?id=GG-090-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:27 +0100 In crystallography a characteristic feature of a serie faces of a crystal where those intersection lines with each other are all parallel. http://www.alexandrite.net/chapters/glossary/zone-of-crystal-faces.html http://www.alexandrite.net/viewpage.html?id=GG-085-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:42 +0100 A fashioned ornament for personal adornment, which is made of noble metals mounted with natural, synthetic, or imitation gemstones. http://www.alexandrite.net/chapters/glossary/jewel.html http://www.alexandrite.net/viewpage.html?id=GG-095-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:47 +0100 A device for weighing gemstone, and diamonds that is provided with a piezoelectric transducer and can digitally read-out the determination. http://www.alexandrite.net/chapters/glossary/electronic-balance.html http://www.alexandrite.net/viewpage.html?id=GG-090-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:26 +0100 The term is applied specially to a variety of chrysoberyl exhibiting a girasol or chatoyant effect, when cut en cabochon. http://www.alexandrite.net/chapters/glossary/cymophane.html http://www.alexandrite.net/viewpage.html?id=GG-088-00013 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:22 +0100 The scientific study of minerals; their formation, occurrence, chemical composition, physical properties, and their classification. Oryctognosy and oryctology are obsolete terms. http://www.alexandrite.net/chapters/glossary/mineralogy.html http://www.alexandrite.net/viewpage.html?id=GG-098-00006 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:34 +0100 A crystal or mineral that contains the inclusions of smaller crystals of different minerals or may be is the same as host mineral. http://www.alexandrite.net/chapters/glossary/host-crystal.html http://www.alexandrite.net/viewpage.html?id=GG-093-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:08 +0100 A craftsman who cuts, polishes, and engraves colored gemstones, other than diamonds. A worker who cuts, and polishes diamonds is known as a diamond cutter. http://www.alexandrite.net/chapters/glossary/lapidary.html http://www.alexandrite.net/viewpage.html?id=GG-097-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:44 +0100 A lamp that emits light whose spectral distribution curve is approximately similar to daylight, such as fluorescent or incandescent lamp. http://www.alexandrite.net/chapters/glossary/daylight-lamp.html http://www.alexandrite.net/viewpage.html?id=GG-089-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:24 +0100 A term applied to flattened tiny twin crystals in corundum they are developed on the basal plane. http://www.alexandrite.net/chapters/glossary/v-shaped-inclusions-in-corundum.html http://www.alexandrite.net/viewpage.html?id=GG-081-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:34 +0100 Impenetrable to light. A stone is opaque, when light cannot passed through a thin-section of 0.04 mm. For example pyrite, cuprite, etc. http://www.alexandrite.net/chapters/glossary/opaque.html http://www.alexandrite.net/viewpage.html?id=GG-100-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:41 +0100 Undesirable term that means no internal flaws that is visible to the unaided eye of a diamond-clarity grader. http://www.alexandrite.net/chapters/glossary/eye-perfect.html http://www.alexandrite.net/viewpage.html?id=GG-090-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:27 +0100 A misleading term for both suitably colored synthetic sapphire and spinel, which are used to create alexandrite doublet. http://www.alexandrite.net/chapters/glossary/alexandrite-doublet.html http://www.alexandrite.net/viewpage.html?id=GG-086-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:10 +0100 A chatoyant variety of alexandrite, with parallel inclusions. Cut en cabochon, it has a light cat's-eye effects. http://www.alexandrite.net/chapters/glossary/alexandrite-cat-s-eye.html http://www.alexandrite.net/viewpage.html?id=GG-086-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:10 +0100 The pictorial graphical representation of the shape of a wave obtained by plotting the values of the periodic quantity against the time. http://www.alexandrite.net/chapters/glossary/wave-form-of-light.html http://www.alexandrite.net/viewpage.html?id=GG-082-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:34 +0100 A System International (SI) unit of thermodynamic temperature scale, commences at absolute zero, equal to 1/273.16 C degree. http://www.alexandrite.net/chapters/glossary/kelvin-temperature-scale.html http://www.alexandrite.net/viewpage.html?id=GG-096-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:43 +0100 A line runs through the center of a crystal, to which all faces of a given zone are parallel. http://www.alexandrite.net/chapters/glossary/zone-axis.html http://www.alexandrite.net/viewpage.html?id=GG-085-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:41 +0100 A narrow beam of light, which emanate from a single bright source that proceed in one direction. http://www.alexandrite.net/chapters/glossary/ray.html http://www.alexandrite.net/viewpage.html?id=GG-103-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:57 +0100 Synthetic alexandrite crystals are made by flux-fusion method by annexing Fe, and Cr manufactured in USA and Japan. http://www.alexandrite.net/chapters/glossary/flux-grown-synthetic-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-091-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:29 +0100 A transparent gemstone that displays pleochroism, when light is passed through it from different direction. http://www.alexandrite.net/chapters/glossary/trichroism.html http://www.alexandrite.net/viewpage.html?id=GG-105-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:29 +0100 The regular, orderly, periodic or repeated arrangement of atoms, molecules, or ions in a crystal. http://www.alexandrite.net/chapters/glossary/crystal-structure-formation.html http://www.alexandrite.net/viewpage.html?id=GG-088-00011 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:22 +0100 Commonly twinned pseudohexagonal, as trillings, cyclic twin or flowers exist in some Russian alexandrite. http://www.alexandrite.net/chapters/glossary/alexandrite-twinning.html http://www.alexandrite.net/viewpage.html?id=GG-086-00007 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:11 +0100 Needles of actinolite and goethite, mica, apatite, quartz, displaying two or three phases of inclusions. http://www.alexandrite.net/chapters/glossary/alexandrite-inclusions.html http://www.alexandrite.net/viewpage.html?id=GG-086-00006 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:11 +0100 An enamel made of special porcelain used in jewelry as insignia and art objects. http://www.alexandrite.net/chapters/glossary/jewel-enamel.html http://www.alexandrite.net/viewpage.html?id=GG-095-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:28 +0100 A promotion term for synthetic alexandrite or alexandrite cat's-eye made by Kyocera company, Japan. http://www.alexandrite.net/chapters/glossary/inamori-synthetic-pulled-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-094-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:07 +0100 A non-profit professional organization of jewelers funded by Robert Shipley in 1934. http://www.alexandrite.net/chapters/glossary/american-gem-society.html http://www.alexandrite.net/viewpage.html?id=GG-086-00011 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:14 +0100 A misleading term for synthetic alexandrite-like sapphire, which changes color. Also called synthetic alexandrite. http://www.alexandrite.net/chapters/glossary/alexandrine.html http://www.alexandrite.net/viewpage.html?id=GG-086-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:09 +0100 A mineral or substance, which occurs in nature; opposite of synthetic or man-made. http://www.alexandrite.net/chapters/glossary/natural.html http://www.alexandrite.net/viewpage.html?id=GG-099-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:33 +0100 A group of crystal faced intersection, which are parallel to a common line. http://www.alexandrite.net/chapters/glossary/zone.html http://www.alexandrite.net/viewpage.html?id=GG-085-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:41 +0100 The weight of elements or component parts, in percentage in a rock. http://www.alexandrite.net/chapters/glossary/chemical-composition.html http://www.alexandrite.net/viewpage.html?id=GG-088-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:18 +0100 A misleading term for reddish-violet almandine garnet from Sri Lanka (Ceylon). http://www.alexandrite.net/chapters/glossary/kandy-spinel.html http://www.alexandrite.net/viewpage.html?id=GG-096-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:45 +0100 One of the 3 optic axes and intermediate axis in biaxial crystal. http://www.alexandrite.net/chapters/glossary/y-axis.html http://www.alexandrite.net/viewpage.html?id=GG-084-00001 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:38 +0100 Suitably-colored, synthetic sapphire and spinel, used to imitate alexandrite. http://www.alexandrite.net/chapters/glossary/alexandrite-like-synthetics.html http://www.alexandrite.net/viewpage.html?id=GG-086-00008 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:12 +0100 A binary composition of oxygen with metals or other elements. http://www.alexandrite.net/chapters/glossary/oxide.html http://www.alexandrite.net/viewpage.html?id=GG-100-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:38 +0100 The tweezers used in jewelry to hold a jewel or gemstone. http://www.alexandrite.net/chapters/glossary/jewel-tweezers.html http://www.alexandrite.net/viewpage.html?id=GG-095-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:28 +0100 Chrysoberyl cat's eye from various gem-bearing districts of Minas-Gerais, Brazil. http://www.alexandrite.net/chapters/glossary/brazilian-cat-s-eye.html http://www.alexandrite.net/viewpage.html?id=GG-087-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:16 +0100 Beautiful sapphire and rubies occur in various parts of Kashmir, Pakistan. http://www.alexandrite.net/chapters/glossary/kashmir.html http://www.alexandrite.net/viewpage.html?id=GG-096-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:42 +0100 Pertaining to, produced by, or changing form during the metamorphism. http://www.alexandrite.net/chapters/glossary/metamorphic.html http://www.alexandrite.net/viewpage.html?id=GG-098-00002 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:48 +0100 An instrument to measure the color of brilliants. http://www.alexandrite.net/chapters/glossary/electronic-colorimeter.html http://www.alexandrite.net/viewpage.html?id=GG-090-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:26 +0100 A misleading term for a garnet, which display color change. http://www.alexandrite.net/chapters/glossary/alexandrite-garnet.html http://www.alexandrite.net/viewpage.html?id=GG-086-00005 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:10 +0100 Fine, greenish-yellow chrysoberyl, from the state Minas Novas, Brazil. http://www.alexandrite.net/chapters/glossary/brazilian-chrysoberyl.html http://www.alexandrite.net/viewpage.html?id=GG-087-00006 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:17 +0100 A misleading term for yellowish-green variety of sapphire. http://www.alexandrite.net/chapters/glossary/oriental-chrysoberyl.html http://www.alexandrite.net/viewpage.html?id=GG-100-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:40 +0100 Acicular a needle form of inclusions in gemstones. http://www.alexandrite.net/chapters/glossary/needlelike-silk.html http://www.alexandrite.net/viewpage.html?id=GG-099-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:42 +0100 A misleading term for alexandrite-like sapphire. http://www.alexandrite.net/chapters/glossary/blue-alexandrite.html http://www.alexandrite.net/viewpage.html?id=GG-087-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:16 +0100 More specially applied to chrysoberyl cat's-eye only. http://www.alexandrite.net/chapters/glossary/cymophane.html http://www.alexandrite.net/viewpage.html?id=GG-088-00014 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:23 +0100 Schist consisting largely of micas and quartz. http://www.alexandrite.net/chapters/glossary/mica-schist.html http://www.alexandrite.net/viewpage.html?id=GG-098-00004 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:55:42 +0100 Flux-grown synthetic ruby, flus-fusion method. http://www.alexandrite.net/chapters/glossary/kashan-flux-grown-rubies.html http://www.alexandrite.net/viewpage.html?id=GG-096-00003 info@multicolour.com Consumer Information/Jewelry and Gemstones Sat, 3 Jul 2010 03:54:46 +0100