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: Courtesy: Sotheby's
: Courtesy: Evan Caplan (top), AF Greenwood (middle), Bear Essentials (bottom)
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Research & News
Gems & Gemology
2019 G&G Challenge
Take the 25 question G&G Challenge. Earn a perfect score, and your name will be listed in the Fall 2019 issue of Gems & Gemology.
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Gem News International
Boulder Opal Mining with Rod Griffin
An update on boulder opal mining activity in Queensland, Australia.
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Lab Notes
Faint Green HPHT Synthetic Diamonds
Faint green HPHT synthetic diamonds recently submitted to the Carlsbad lab owe their color to high concentrations of nickel.
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Micro-World
Condor Agate from Argentina
A vibrant orange and yellow agate displays interesting concretions in its core.
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Gem News International
Colombian Emeralds and Mozambican Rubies
An update on activity at the Coscuez emerald source, as well as ruby deposits in Mozambique.
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Micro-World
Star-Like Growth in Natural Yellow Sapphire
A natural yellow sapphire features a distinctive star-like graining pattern.
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