A Classification Scheme of Natural Radiation Stain Morphology and Texture on Diamond
Examines samples of Mona Lisa turquoise to identify their chemistry and structure, revealing copper as a major elemental component of the material.
Historical Reading List: Ruby and Balas Ruby (Spinel)
Historical Reading List: Persian Turquoise
Historical Reading List: Peridot from Egypt
Historical Reading List: Tourmaline and other Gem Minerals from Southern California
Enumerating Diamond Cuts
Historical Reading List: Tourmaline and other Gem Minerals from Maine
The Transformation of Diamond Cut Quality Grading: Where Are We Now?
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.
Now Enrolling – New GIA London Campus Opening this Fall
The soon-to-open GIA campus in London is now enrolling students for classes beginning in August 2026.
GIA、ダイヤモンドの産地追跡ブロックチェーン・プラットフォーム「Tracr」の株式30％を取得
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。
GIA、ダイヤモンドの産地追跡ブロックチェーン・プラットフォーム「Tracr」の株式30％を取得
John Cowley Joins GIA as Chief Financial Officer
ジョン・カウリーがGIAの最高財務責任者に就任
GIA 台灣校區煥新啟程‧嶄新亮相
GIA、台湾に新キャンパスを開設
Tom Moses 將於五月離開 GIA
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.
トム・モーゼス、5月にGIAを退職
G&G In a Flash: Nature’s Diamond Sculptures
Explore nature’s diamond sculptures—264 rare rough diamonds examined by GIA scientists for their unique shapes and raw brilliance.
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