alexandrite natural of photo stone

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241. 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
242. 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
243. 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
244. 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
245. 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
246. 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
247. 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
248. Irradiation: 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; HTML, 25 Kb, 2008-07-20 13:05:02; /chapters/glossary/irradiation.html
249. Jewel: A fashioned ornament for personal adornment, which is made of noble metals mounted with natural, synthetic, or imitation gemstones.; HTML, 23 Kb, 2008-07-20 13:05:05; /chapters/glossary/jewel.html
250. Jewel enamel: An enamel made of special porcelain used in jewelry as insignia and art objects.; HTML, 23 Kb, 2008-07-20 13:05:07; /chapters/glossary/jewel-enamel.html
251. Jewelry: 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.; HTML, 23 Kb, 2008-07-20 13:05:11; /chapters/glossary/jewelry.html
252. Jewels of India: 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.; HTML, 24 Kb, 2008-07-20 13:05:13; /chapters/glossary/jewels-of-india.html
253. Karat: 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; HTML, 24 Kb, 2008-07-20 13:05:18; /chapters/glossary/karat.html
254. Kashmir: Beautiful sapphire and rubies occur in various parts of Kashmir, Pakistan.; HTML, 23 Kb, 2008-07-20 13:05:22; /chapters/glossary/kashmir.html
255. Kelvin temperature scale: A System International (SI) unit of thermodynamic temperature scale, commences at absolute zero, equal to 1/273.16 C degree.; HTML, 23 Kb, 2008-07-20 13:05:24; /chapters/glossary/kelvin-temperature-scale.html
256. Laminate: 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.; HTML, 23 Kb, 2008-07-20 13:05:27; /chapters/glossary/laminate.html
257. Laser: 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; HTML, 25 Kb, 2008-07-20 13:05:31; /chapters/glossary/laser.html
258. Light absorption: 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; HTML, 24 Kb, 2008-07-20 13:05:33; /chapters/glossary/light-absorption.html
259. Luminescence: 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; HTML, 25 Kb, 2008-07-20 13:05:35; /chapters/glossary/luminescence.html
260. Magma: 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.; HTML, 24 Kb, 2008-07-20 13:05:38; /chapters/glossary/magma.html
261. Metamorphic rock: 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,; HTML, 24 Kb, 2008-07-20 13:05:42; /chapters/glossary/metamorphic-rock.html
262. Mica schist: Schist consisting largely of micas and quartz.; HTML, 23 Kb, 2008-07-20 13:05:44; /chapters/glossary/mica-schist.html
263. Mineral: 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; HTML, 24 Kb, 2008-07-20 13:05:45; /chapters/glossary/mineral.html
264. Mineralogy: The scientific study of minerals; their formation, occurrence, chemical composition, physical properties, and their classification. Oryctognosy and oryctology are obsolete terms.; HTML, 23 Kb, 2008-07-20 13:05:47; /chapters/glossary/mineralogy.html
265. Moh's hardness scale: 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; HTML, 24 Kb, 2008-07-20 13:05:49; /chapters/glossary/moh-s-hardness-scale.html
266. Natural: A mineral or substance, which occurs in nature; opposite of synthetic or man-made.; HTML, 23 Kb, 2008-07-20 13:05:53; /chapters/glossary/natural.html
267. Needlelike (silk): Acicular a needle form of inclusions in gemstones.; HTML, 23 Kb, 2008-07-20 13:05:56; /chapters/glossary/needlelike-silk.html
268. Negative reading: 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; HTML, 24 Kb, 2008-07-20 13:05:58; /chapters/glossary/negative-reading.html
269. Novosibirsk synthetic alexandrite: 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.; HTML, 24 Kb, 2008-07-20 13:06:00; /chapters/glossary/novosibirsk-synthetic-alexandrite.html
270. Opaque: Impenetrable to light. A stone is opaque, when light cannot passed through a thin-section of 0.04 mm. For example pyrite, cuprite, etc.; HTML, 23 Kb, 2008-07-20 13:06:03; /chapters/glossary/opaque.html

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Alexandrite

alexandrite natural of photo stone

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