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.
Enumerating Diamond Cuts
Historical Reading List: Tourmaline and other Gem Minerals from Southern California
Historical Reading List: Peridot from Egypt
Historical Reading List: Ruby and Balas Ruby (Spinel)
Historical Reading List: Persian Turquoise
历史文献清单: 历史上试图合成钻石的经验
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 收购钻石溯源区块链平台 Tracr 30% 股权
John Cowley 加入 GIA 担任首席财务官
John Cowley Joins GIA as Chief Financial Officer
GIA在台湾开设新校区
GIA 台湾校区焕新启程‧崭新亮相
Tom Moses（汤姆·摩西）将于五月离开 GIA
Tom Moses（汤姆·摩西）将于五月离开 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.
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