Research

Photochromic zircon shows significant color change from medium light greenish blue to very dark yellowish green.

A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.

Rex Guo describes how he sources and systematically recuts faceted stones to unlock their inner beauty.

Bill Larson of Pala International reports a very strong AGTA Tucson show.

Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original color through the use of incandescent light.

Angela Conty exhibits and discusses her work at the 2016 Tucson gem shows.

Follow these tips to keep your jewelry treasures safe and looking their best.

Trace-element analysis is used to identify metamictization, treatment, and growth conditions of zircon.

Green gemstones, which can uplift and heal our spirits, have been popular gem choices ever since we began to adorn ourselves with jewelry.

Color modification is observed in a reddish orange zircon at the Bangkok laboratory.