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Bob Jones, "Rock & Gem Magazine, South American Condor agate", Ventura, California, Miller Magazines, September 1995 Frazier, Si; Frazier, Ann (December 1996). "Soaring in from South America : Condor agate, with its dramatically contrasting bands of vivid colors, is alighting in the midst of the gem world after a long flight from Patagonia.
Contact us; Contribute Help; Learn to edit; ... 4 Rocks. 5 Chatoyant gems. 6 Asterism. 7 See also. ... There are a number of organic materials used as gems, including ...
When the gemstones are in a rough state, the gemologist studies the external structure; the host rock and mineral association; and natural and polished color. Initially, the stone is identified by its color, refractive index, optical character, specific gravity, and examination of internal characteristics under magnification.
GIA also exists to educate the gem and jewelry industry and the general public through its publications and outreach efforts. Most notable of these efforts is the quarterly publication of the magazine Gems & Gemology, a respected journal in the field. The journal includes full-length feature articles, as well as reports on GIA research ...
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Gems & Gemology is a quarterly scientific journal published by the Gemological Institute of America. Each issue is devoted to research on diamonds , gemstones , and pearls . Topics include geographic sources, imitations and synthetics, treatments, and identification techniques.
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