: Courtesy of Evan Caplan (Imperial), RareSource (pink oval).
Gift of Ronald H. Tanaka (blue oval)
Gift of Ronald H. Tanaka (blue oval)
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Research & News
Lab Notes
Pink Mozambique Sapphire
Examination and testing of a beautiful large pink sapphire establishes its lack of treatment and its origin in Mozambique.
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Webinar Series
GIA Knowledge Sessions
Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology.
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Gem News International
Occurrence of Petrified Woods in the Russian Far East: Gemology and Origin
Scientists in Russia construct an origin story through the analysis of petrified wood popularly used in the souvenir trade.
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Micro-world
Trapiche-Like Pattern in an Emerald from Pakistan
Brightfield illumination reveals a distinctive growth pattern similar to trapiche in a beautiful emerald from Swat Valley.
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Lab Notes
Quench-Crackled Dyed Blue Chalcedony Resembling Larimar
Raman spectroscopy confirms sea-blue beads with a similar appearance to Larimar are actually quench-crackled chalcedony.
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Gem News International
Greenish Blue Glass Imitating Gem Silica
Gift shop specimens sold as gem silica prove to be good imitations in colored glass.
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