GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.
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G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.
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The Stayish mine in Ethiopia’s Wollo province has been producing black opal since 2013.
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An investigation of a coated fire opal recently found in the Chinese market.
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Matrix opal from Andamooka, in South Australia, is a precious opal-included porous rock that is commonly colour enhanced (carbon impregnated) to imitate the highly prized black opal from Lightning Ridge in northern New South Wales, Australia.
Read MoreA plastic imitation opal that shows true play-of-colour was advertised as "new" and offered for sale under the trade name "Opalite" at the Gem and Lapidary Dealers Association (GLDA) Tucson show in February 1988.
Read MoreGemmological and chemical analysis of bright green gem-quality opal from Tanzania.
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This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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This article, from the Winter 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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This article, from the Summer 2010 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside Gems & Gemology.
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