featured Research & News

Gem News International

Iridescent
Inclusions in Scapolite

GIA’s Carlsbad lab recently examined two that exhibited prominent iridescence in reflected light.
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Research News

New Cobalt Diffusion Treatment of Spinel

The GIA Lab examines unusual-looking, strongly colored blue spinels; reports on a new treatment.
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Tucson 2015

Large Gem Rainbow Discs

Brian Cook’s “wheels of light” reflect the optical effects of gems encased in clear quartz.
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Tucson 2015

Demand for Fine Colored Gems Continues

Dave Bindra shares highlights from colored gem collection, talks “recirculated” gems market.
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Tucson 2015

Oregon
Sunstone

An update on the demand and market of Oregon sunstone and plans for a sunstone miners’ association.
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