Enriching a Tradition
By Duncan Pay, Editor-in-Chief

We’re placing a remarkable resource—almost 80 years—of groundbreaking gemological knowledge at your fingertips.

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Articles (4)


Infrared Spectroscopic Study of Filled Moonstone

Li Jianjun, Weng Xiaofan, Yu Xiaoyan, Liu Xiaowei, Chen Zhenyuand Li Guihua

A study on how infrared spectroscopy provides conclusive evidence of impregnated moonstone.ation of impregnated moonstone.

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A Comparison of Modern and Fossil Ivories Using Multiple Techniques

Zuowei Yin, Pengfei Zhang, Quanli Chen, Chen Zhengand Yuling Li

This article provides identification criteria to distinguish between modern and fossil (mammoth) elephant ivory.

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Gemological Characteristics of Saltwater Cultured Pearls Produced After Xenotransplantation

Stefanos Karampelasand Aurore Lombard

Spectroscopic and radiographic study of experimental saltwater cultured pearls produced from xenotransplantation between P. margaritifera and P. maxima.

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Regular Features

Lab notes
Lab Notes

The latest advances and findings from GIA laboratories.

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Gem News
Gem News International

Global coverage of gem sources, notable new gem materials, and recent industry developments.

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Book Review
Book Reviews

Your guide to the latest gem and jewelry books and other media.

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Gemological Abstracts

Summaries of important gem and jewelry articles recently published elsewhere.

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CVD Synthetic Diamonds from Gemesis Corp
Wuyi Wang, Ulrika F. S. D’Haenens-Johansson, Paul Johnson, Kyaw Soe Moe, Erica Emerson, Mark Newton, and Thomas M. Moses Wuyi Wang, Ulrika F. S. D’Haenens-Johansson, Paul Johnson, Kyaw Soe Moe, Erica Emerson, Mark Newton, and Thomas M. Moses

Gemstones from Vietnam: An Update
Le Thi-Thu Huong, Tobias Häger, Wolfgang Hofmeister, Christoph Hauzenberger, Dietmar Schwarz, Pham Van Long, Ursula Wehmeister, Nguyen Ngoc Khoi, and Nguy Tuyet Nhung

Emeralds from the Fazenda Bonfim Region, Rio Grande do Norte, Brazil
J. C. (Hanco) Zwaan, Dorrit E. Jacob, Tobias Häger, Mário T. O. Cavalcanti Neto, and Jan Kanis

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