Identification of Natural, Reconstructed, and Imitation Root Amber
Three types of root amber beads submitted for identification are analyzed in Wuhan, China.
The Distinction of Natural from Synthetic Alexandrite by Infrared Spectroscopy
A useful way to identify stones that contain no distinguishing inclusions.
Spray of Columbite Crystals in Topaz
A cluster of bladed columbite crystals is identified in colorless topaz.
Turquoise Planet Earth
A sphere of Armenian turquoise with natural brown matrix material mimics planet Earth.
Polymer-Filled Aquamarine
The authors have encountered hundreds of polymer-filled aquamarines in the Chinese jewelry market.
寺庙与珍宝
《南亚庙宇与珍宝》——这场璀璨夺目的全新展览落户于加利福尼亚州卡尔斯巴德的 GIA 总部，带领参观者沉浸于富丽堂皇的庙宇景致之中。此处陈列的宝石、宝石晶体与珠宝不仅是诱人的闪耀之物，更是通往更高神力的通道。
Unusual Cloud in Diamond
A diamond with a previously unseen clarity characteristic is seen in GIA’s Carlsbad lab.
GIA Mobile Application Privacy Notice
GIA 报告结果 API
GIA 报告结果 API 将多款应用程序与 GIA 数据库集成，用于验证分级信息，检索 PDF 版 GIA 报告、图像以及其他 GIA 报告相关资源。此服务适用于 GIA 报告核对中的所有报告。
Freshwater Pearls vs. Saltwater Pearls: Understanding the Difference
A Purpose Shaped by History, Renewed for the Future
An overview of the Spring 2026 Gems & Gemology content.
X-ray Computed Microtomography Applied to Pearls: Methodology, Advantages, and Limitations
X-ray computed microtomography reveals the internal features of pearls with great detail.
X-ray Computed Microtomography: Distinguishing Natural Pearls from Beaded and Non-Beaded Cultured Pearls
The distinction of natural from cultured pearls traditionally has been based on X-radiography.
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