Research & News
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.
Boulder Opal Mining with Rod Griffin
An update on boulder opal mining activity in Queensland, Australia.
Faint Green HPHT Synthetic Diamonds
Faint green HPHT synthetic diamonds recently submitted to the Carlsbad lab owe their color to high concentrations of nickel.
Condor Agate from Argentina
A vibrant orange and yellow agate displays interesting concretions in its core.
Colombian Emeralds and Mozambican Rubies
An update on activity at the Coscuez emerald source, as well as ruby deposits in Mozambique.
Star-Like Growth in Natural Yellow Sapphire
A natural yellow sapphire features a distinctive star-like graining pattern.