Five CVD Synthetic Diamonds Greater Than Three Carats
The GIA lab examines five gem-quality CVD-grown diamonds in sizes that reflect the improving technology of the synthetic gemstone industry.
HPHT-Processed Diamond Fraudulently Represented as Untreated
An HPHT-treated round brilliant diamond with an inscription that presents as a GIA report number is found to be inconsistent with the institute's report, previously issued for an untreated diamond.
Cat's-Eye Demantoid and Brown Andradite with Horsetail Inclusions
The examination of two unusual garnets results in identifications issued for the first time in GIA's colored stone report records.
Fracture-Filled Diamond with "Rainbow" Flash Effect
The material used to fill a large fracture in a diamond yields an unexpected iridescence under two different illuminations.
Natural-Color Green Diamonds: A Beautiful Conundrum
Characterizes diamonds with exceptionally rare natural green color, based on GIA’s extensive database of samples.
Iridescence in Metamorphic “Rainbow” Hematite
Analyzes the substructures that cause the intense iridescence observed in “rainbow” hematite from Minas Gerais, Brazil.
DNA Techniques Applied to the Identification of Pinctada Fucata Pearls from Uwajima, Ehime Prefecture, Japan
Shows how genetic material extracted from small amounts of pearl powder can be a useful indicator of this akoya cultured pearl species.
Zoning In on Liddicoatite Exhibit
An exhibit at the Tucson Gem and Mineral Show dedicated to former GIA president Richard T. Liddicoat (1918–2002).
Preview of Nature Art Science with Paula Crevoshay
Renowned designer Paula Crevoshay discusses artistic influences and her latest creations.
Spring 2018 G&G: Color Origin of Green Diamonds, Iridescence in Hematite, and the Outlook from Tucson
A summary of the Spring 2018 issue of Gems & Gemology.
DNA Techniques Applied to the Identification of Pinctada Fucata Pearls from Uwajima, Ehime Prefecture, Japan Supplementary Data
Shows how genetic material extracted from small amounts of pearl powder can be a useful indicator of this akoya cultured pearl species.
Non-Bead-Cultured Pearls from Pinctada margaritifera
A new report from GIA's Bangkok laboratory examines a set of 120 NBC samples stated to be of "Tahitian" origin.
莫桑比克红宝石“低温”热处理研究进展：重点关注包裹体和傅里叶变换红外光谱
Non-Bead-Cultured Pearls from Pinctada margaritifera
A new report from GIA's Bangkok laboratory examines a set of 120 NBC samples stated to be of "Tahitian" origin.
New Developments and Opportunities for GIA Alumni Association Chapters and Members
A renewed structure, expanded education opportunities and other tools will help GIA Alumni Association chapters and members communicate GIA connection.
M.D. Hohenstine 宝石陈列：使用未镶嵌的宝石创造流行橱窗艺术的过程
珠宝商 M.D. Hohenstine 令人惊艳的橱窗陈列是俄亥俄州哥伦比亚市中心一项备受欢迎的传统，拥有 50 多年的历史。
宝石学家意欲激起全世界对巨大晶体的好奇心
‘Adventure seeker’ crawls through underground caves to reach and research giant selenite crystals – then shares her knowledge with the world.
宝石“画”讲述一位大师级工匠、宝石和珠宝导师的故事
A jeweler who quietly built a circle of inspiration and influence lives on in generations of GIA-educated jewelers and gemologists.
Smaller 2018 Basel Fair is Still Biggest Rare Gem Showcase
Business at the scaled-down Baselworld 2018 Show was spotty. Some jewelry brands and gem dealers had respectable sales, but others found slow trading.
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