alexandrite natural of photo stone

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241. Garnets: 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; HTML, 24 Kb, 2008-07-20 13:04:29; /chapters/glossary/garnets.html
242. Gem Cut 11.7x8mm Chrysoberyl Oval 4.53cts.: Hard to find Chrysoberyl (Chrysoberyl) Oval 4.53cts from Tanzania (Tunduru); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-chrysoberyl-oval-4-53-faceted_ycb146ng
243. Gem Quality Alexandrite at Alexandrite discussion forums | Alexandrite guide: Gem Quality Alexandrite at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2007-10-08 20:49:00; /discussion/topic/gem-quality-alexandrite-FRM-174
244. Gem Studies Lab: GAA was formed in Sydney, on the 29th October 1945, the Association has been responsible for producing Australia’s gemmologists by educating and updating members of the gem and jewellery industry and the general public, about all aspects of gemstones an; HTML, 66 Kb, 2009-03-15 02:18:56; /directory/laboratories/gem-studies-lab-wdd-003-00009.html
245. Gemmological Association of Great Britain: Gem-A, which began as a Gemmological Committee of the National Association of Goldsmiths, first introduced a gemmology qualification in 1908 in order to encourage jewelers to understand the gems they were selling and to identify the fakes.; HTML, 65 Kb, 2009-03-15 03:22:40; /directory/laboratories/gemmological-association-of-great-britain-wdd-003-00022.html
246. Gemmy Color Change Alexandrite Oval 5.08cts.: Extremely rare Alexandrite (Chrysoberyl) Oval 5.08cts from Tanzania (Tunduru); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-oval-5-08-faceted_AX4139aa
247. Gemological Institute of America: GIA is considered the world's most trusted name in diamond grading and gemstone identification. GIA’s D-to-Z colour-grading scale and Flawless-to-I3 clarity-grading scale are recognized by gem and jewellery professionals everywhere. And, by extension, t; HTML, 65 Kb, 2009-03-15 03:18:30; /directory/laboratories/gemological-institute-of-america-wdd-003-00021.html
248. GemResearch Swisslab: Private gemological research company focused on the characterization of high-quality gems from newly opened mines.; HTML, 65 Kb, 2009-03-15 03:01:18; /directory/laboratories/gemresearch-swisslab-wdd-003-00016.html
249. Gemstone: 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; HTML, 25 Kb, 2008-07-20 13:04:30; /chapters/glossary/gemstone.html
250. Gemstone cuts: Any forms or styles used in the fashioning of gemstones such as antique cut, brilliant cut, emerald cut, baguette, cabochon, rose cut, etc.; HTML, 23 Kb, 2008-07-20 13:04:32; /chapters/glossary/gemstone-cuts.html
251. General form: 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; HTML, 24 Kb, 2008-07-20 13:04:34; /chapters/glossary/general-form.html
252. Genuine alexandrite and diamond vintage ring at Alexandrite discussion forums | Alexandrite guide: Genuine alexandrite and diamond vintage ring at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-04-11 14:07:00; /discussion/post/genuine-alexandrite-and-diamond-vintage-ring-FRM-287-00007
253. GIA Gem Trade Laboratory: A subsidiary company of the Gemological Institute of America Enterprises, which provides professional grading and identification for the diamond and colored stone industries.; HTML, 24 Kb, 2008-07-20 13:04:36; /chapters/glossary/gia-gem-trade-laboratory.html
254. Glossary of Terms for Alexandrite Gemstone Buyer and Collector's Guide: Glossary of terms that have been discussed or mentioned at Alexandrite gemstone buyer and collectors guide; HTML, 38 Kb, 2008-07-20 13:02:49; /chapters/glossary/index.html
255. Grading a color change gems? at Alexandrite discussion forums | Alexandrite guide: Grading a color change gems? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2006-11-12 14:22:26; /discussion/topic/grading-a-color-change-gems-FRM-167
256. Gubelin Gemological Laboratories: Dr. Eduard J. Gubelin, one of the forefathers of modern gemology, and who was a Founding Organizing Member as well as an Honorary Member of the International Colored Gemstone Association (ICA), passed away in Lucerne, Switzerland in March at the age of 91; HTML, 66 Kb, 2009-03-15 03:05:18; /directory/laboratories/gubelin-gemological-laboratories-wdd-003-00017.html
257. Hardness: 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; HTML, 25 Kb, 2008-07-20 13:04:40; /chapters/glossary/hardness.html
258. Heated stone: 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.; HTML, 23 Kb, 2008-07-20 13:04:42; /chapters/glossary/heated-stone.html
259. Heavy minerals: 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.; HTML, 24 Kb, 2008-07-20 13:04:43; /chapters/glossary/heavy-minerals.html
260. Host crystal: A crystal or mineral that contains the inclusions of smaller crystals of different minerals or may be is the same as host mineral.; HTML, 23 Kb, 2008-07-20 13:04:45; /chapters/glossary/host-crystal.html
261. How can I add my gemstone? at Alexandrite discussion forums | Alexandrite guide: How can I add my gemstone? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2006-08-29 20:23:00; /discussion/topic/how-can-i-add-my-gemstone-FRM-156
262. How can I check the color change in an alexandrite: Two kinds of light are required to observe color change; daylight and incandescent light?; HTML, 25 Kb, 2008-07-29 08:12:38; /chapters/faq/how-can-i-check-the-color-change-in-an-alexandrite.html
263. How can I spot the difference between a natural and a synthetic alexandrite?: HTML, 26 Kb, 2008-07-29 08:11:26; /chapters/faq/how-can-i-spot-the-difference-between-a-natural-and-a-synthetic-alexandrite.html
264. How much will a typical one carat alexandrite gemstone cost?: 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; HTML, 25 Kb, 2008-07-29 08:11:03; /chapters/faq/how-much-will-a-typical-one-carat-alexandrite-gemstone-cost.html
265. How much will a typical one carat alexandrite gemstone cost? at Alexandrite discussion forums | Alexandrite guide: How much will a typical one carat alexandrite gemstone cost? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2013-03-18 12:31:54; /discussion/topic/how-much-will-a-typical-one-carat-alexandrite-gems-FRM-458
266. Hue: 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.; HTML, 24 Kb, 2008-07-20 13:04:47; /chapters/glossary/hue.html
267. I have an alexandrite ring that my parents purchased in the 50s, what are the chances the stone is a genuine natural alexandrite?: 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; HTML, 27 Kb, 2008-07-29 08:11:37; /chapters/faq/what-are-the-chances-an-alexandrite-purchased-in-the-50s-is-natural.html
268. I was told this was an alexandrite when given to me. at Alexandrite discussion forums | Alexandrite guide: I was told this was an alexandrite when given to me. at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2011-06-09 02:01:22; /discussion/topic/i-was-told-this-was-an-alexandrite-when-given-to-m-FRM-424
269. I would really like to find out more about my alexandrite ring please at Alexandrite discussion forums | Alexandrite guide: I would really like to find out more about my alexandrite ring please at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2011-08-02 08:30:00; /discussion/topic/i-would-really-like-to-find-out-more-about-my-alex-FRM-429
270. Icgems: HTML, 63 Kb, 2009-03-30 07:42:28; /directory/gemstone-dealers/icgems-wdd-003-00031.html
271. Ilakaka alexandrite deposit location at Alexandrite discussion forums | Alexandrite guide: Ilakaka alexandrite deposit location at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2006-09-03 16:29:00; /discussion/topic/ilakaka-alexandrite-deposit-location-FRM-170
272. Imitation: 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; HTML, 25 Kb, 2008-07-20 13:04:51; /chapters/glossary/imitation.html
273. In Development at Alexandrite discussion forums | Alexandrite guide: In Development at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2006-09-02 18:33:17; /discussion/topic/in-development-FRM-154
274. In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide: In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2011-06-06 03:31:34; /discussion/topic/in-need-of-help-identifying-FRM-423
275. In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide: In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2011-06-06 03:29:28; /discussion/topic/in-need-of-help-identifying-FRM-422
276. Inamori synthetic pulled alexandrite: A promotion term for synthetic alexandrite or alexandrite cat's-eye made by Kyocera company, Japan.; HTML, 23 Kb, 2008-07-20 13:04:52; /chapters/glossary/inamori-synthetic-pulled-alexandrite.html
277. Incandescence: 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; HTML, 25 Kb, 2008-07-20 13:04:54; /chapters/glossary/incandescence.html
278. Inclusion in chrysoberyl: 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; HTML, 24 Kb, 2008-07-20 13:04:56; /chapters/glossary/inclusion-in-chrysoberyl.html
279. Inclusions: 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; HTML, 26 Kb, 2008-07-20 13:04:58; /chapters/glossary/inclusions.html
280. Index of refraction: 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; HTML, 25 Kb, 2008-07-20 13:05:00; /chapters/glossary/index-of-refraction.html

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Alexandrite

alexandrite natural of photo stone

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