Research & News
Merelaniite Inclusions in Tanzanite
A recently identified mineral is found, in whisker-like form, in a gem-quality tanzanite host.
2018 GIA Symposium
Scientists and business leaders will gather at a summit of the gem and jewelry industry.
Unique Star Sapphire with Transparent Core
A sapphire cabochon with an unusual appearance is seen at GIA’s Tokyo lab.
Separating Glass-Filled Rubies Using the DiamondView
The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.
Star Spinel with Four and Six Rays
A cabochon displaying asterism is found to be an untreated spinel with two different stars.
Beryl and Glass Assemblage Imitating Emerald
An unusual assembled stone is examined at GIA’s New York lab.