GIA 7 Pearl Value Factors: An Update on Nacre Classification
A new nacre scale is established in the GIA 7 Pearl Value Factors classification system.
“Goose Bumps” on South Sea Pearl
Pinpoints densely cover the surface of a golden South Sea pearl.
Unique Trapiche Grossular from China
Grossular crystals cut along specific orientations reveal a distinct trapiche structure.
Unusual Patterns in Diamonds Composed of Dark Micro-Inclusions
Two natural diamonds exhibiting dark micro-inclusions are compared in the Carlsbad laboratory.
The Science of Phenomenal Gems, a Summary of Pegmatites, and a Cutter’s Remarkable Journey
An overview of the Summer 2025 Gems & Gemology content.
Ben Kho: From Rough Beginnings to Brilliant Mastery
Profiles the extraordinary life and work of Ben Kho, from a young entrepreneur in Cambodia to an award-winning gem cutter.
Emeralds and Beryl from Kazakhstan and Ukraine
A report from GIA’s Carlsbad laboratory on emerald and beryl samples studied as part of an ongoing beryl characterization research project.
Gem Granitic Pegmatites
Describes the geology, mineralogy, and formation of granitic-composition pegmatites and provides a summary of their worldwide occurrences.
Structures Behind the Spectacle: A Review of Optical Effects in Phenomenal Gemstones and Their Underlying Nanotextures
Provides a comprehensive summary of the special optical effects in gemstones, including opalescence, chatoyancy, asterism, schiller, and iridescence, and investigates the submicron inclusions and nanotextures in each type of phenomenal stone.
GIA 检验全球第二大钻石
2025 年 7 月，GIA 执行副总裁兼研发部和鉴定所首席执行官 Tom Moses（汤姆·摩西）和研发部副总裁 Wuyi Wang（王五一）博士等 GIA 研究人员检验了一颗重达 2,488.32 克拉的钻石原石
GIA 检验全球第二大钻石
2025 年 7 月，GIA 执行副总裁兼研发部和鉴定所首席执行官 Tom Moses（汤姆·摩西）和研发部副总裁 Wuyi Wang（王五一）博士等 GIA 研究人员检验了一颗重达 2,488.32 克拉的钻石原石
GIA 于 10 月 1 日推出更新版实验室培育钻石服务
GIA will launch revised evaluation services for D-to-Z laboratory-grown diamonds on October 1
GIA 于 10 月 1 日推出更新版实验室培育钻石服务
GIA will launch revised evaluation services for D-to-Z laboratory-grown diamonds on October 1
How-To Guide: Testing Diamonds and Gems using UV Light
GIA developed this guide so retailers can use fluorescence tests to help identify gems right in their own stores.
Two Exciting Panels Featured at AGS x GIA Converge
Industry leaders and some of GIA’s most experienced gemological experts will share their expertise and insights with participants at Converge
Two Exciting Panels Featured at AGS x GIA Converge
Industry leaders and some of GIA’s most experienced gemological experts will share their expertise and insights with participants at Converge.
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