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An update on the market presence of beryllium-treated blue sapphires and their identifying characteristics. Two large samples (22 and 53 ct) are also described.

Presents the results of heat treatment and copper-diffusion experiments on light yellow feldspar from the United States, Mexico, and China.

Recent discussion on the possible existence of copper-diffused tourmaline prompted experiments to investigate the feasibility of such a treatment.

GIAのラボサービスを宝石学研究の最前線に導いた世界的に有名な宝石鑑別の専門家。

A look at the

All that was old is new once more – at least when exploring historic trend-setting jewelry styles of the 19th and 20th centuries.

The vice president and director of GIA's New York lab was a fixture on 47th Street for five decades.

This article highlights GIA's founder, Robert M. Shipley Sr.

GIA’s current distinguished research fellow has represented the Institute’s gemological excellence around the world for the past four decades.

Learn about rose quartz's durability and how to care for your rose quartz jewelry.

Kara Ross kicks off the

モザンビーク北部の様々なルビー鉱区への、継続的なGIAフィールド調査に関するレポート。