GIA researchers trace the history and transformation of diamond cut grading, highlighting scientific breakthroughs that are reshaping how cut quality, brilliance, and visual performance are evaluated.

The soon-to-open GIA campus in London is now enrolling students for classes beginning in August 2026.

間もなくオープンするGIAロンドンキャンパスは、2026年8月に始まるクラスの学生を現在受付中です。

GIAは2026年1月1日、デザインを一新したカラーストーンレポートと新サービスを開始します。

The Gemological Institute of America (GIA) announced today that Tom Moses, executive vice president and chief laboratory and research officer, has decided to leave the institute after almost 50 years of service.

Explore nature’s diamond sculptures—264 rare rough diamonds examined by GIA scientists for their unique shapes and raw brilliance.

Phenomenal gemstones dazzle with unique optical effects like iridescence and play-of-color. Discover how your favorite gem phenomena actually work.

GIA（米国宝石学会）は、ジャンマリア・ブチェラッティ財団と共同で、2026年2月6日、第9回「ジャンマリア・ブチェラッティ財団ジュエリーデザイン優秀賞」をGIAカールスバッド校卒業生のCatherine “Cathy” Aulick氏に授与しました。

GIA (Gemological Institute of America), together with the Gianmaria Buccellati Foundation, presented the ninth annual Gianmaria Buccellati Foundation Award for Excellence in Jewelry Design on February 6, 2026, to GIA Carlsbad graduate Catherine “Cathy” Aulick.

George Rossman, a member of the GIA Board of Governors from 1995 to 2007 and professor of mineralogy, emeritus, at the California Institute of Technology (Caltech), passed away on February 6 at age 81.

A perfectly shaped euhedral tourmaline crystal is identified in a faceted tourmaline.