GIA SYSTEMS MAINTENANCE AND OUTAGE – SATURDAY, AUGUST 29
Due to scheduled maintenance, some GIA online services will not be available on Saturday, August 29 between 9:00 a.m. and 1:00 p.m. PT.
Click below for a list of services impacted.
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featured Research & News

Research News

Synthetic Ruby Overgrowth on Corundum

Gemologists examine 10 samples of synthetic ruby overgrowth on natural colorless sapphire “seeds.”
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Feature Article

Panel Discusses Responsible Sourcing

The complex issues − and opportunities − of responsible sourcing in the gem and jewelry industry.
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Research News

Mozambique Ruby: Low-Temp Heat Treatment

Lab uses inclusion analysis, FTIR spectroscopy and LA-ICP-MS to report changes of Mozambique ruby.
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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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