Wuyi Wang and Evan Smith , May 15, 2019

GIA examines a 552.7 ct diamond from the Diavik mine in Canada.

Duncan Pay and Erin Hogarth , May 15, 2019

At the AGTA show, Bridges Tsavorite unveiled the largest known square cushion-cut tsavorite, weighing 116.76 ct.

Troy Ardon and Garrett McElhenny , May 15, 2019

A composite of synthetically grown and natural diamond was recently identified by the Carlsbad laboratory.

Jennifer-Lynn Archuleta, May 15, 2019

A summary of the Spring 2019 issue of Gems & Gemology.

Wasura Soonthorntantikul, Charuwan Khowpong, Ungkhana Atikarnsakul, Sudarat Saeseaw, Supharart Sangsawong, Wim Vertriest, and Aaron Palke, May 1, 2019

Researchers from GIA’s Bangkok laboratory seek to identify low-temperature heat treatment in basalt-related blue sapphires.

Karen V. Smit, April 25, 2019

Mineral inclusions reveal continents’ construction – and help researchers date diamonds.