Historical Reading List: Peridot from Egypt
Historical Reading List: Ruby and Balas Ruby (Spinel)
Historical Reading List: Tourmaline and other Gem Minerals from Southern California
Historical Reading List: Persian Turquoise
Historical Reading List: Tourmaline and other Gem Minerals from Maine
Enumerating Diamond Cuts
The Transformation of Diamond Cut Quality Grading: Where Are We Now?
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 收購鑽石溯源區塊鏈平台 Tracr 30% 股權
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
トム・モーゼス、5月にGIAを退職
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.
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.
G&G in a Flash: Guide to Phenomenal Gems
Phenomenal gemstones dazzle with unique optical effects like iridescence and play-of-color. Discover how your favorite gem phenomena actually work.
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