Trapiche and More...
By Duncan Pay, Editor-in-Chief

A gemological curiosity or an object of beauty in its own right?

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Articles (4)


Large Colorless HPHT Synthetic Diamonds from New Diamond Technology

By Ulrika F.S. D’Haenens-Johansson, Andrey Katrusha, Kyaw Soe Moe, Paul Johnson and Wuyi Wang , Nov 23

Examines a new source of colorless and near-colorless gem-quality HPHT synthetic diamonds using spectroscopic and gemological analysis.

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Letseng’s Unique Diamond Proposition

By Russell Shor, Robert Weldon, A.J.A. (Bram) Janse, Christopher M. Breeding and Steven B. Shirey , Nov 23

Explores the history, geology, and current production of this unique source of large diamonds.

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Origin Determination of Dolomite-Related White Nephrite through IB-LDA

By Zemin Luo, Mingxing Yang and Andy H. Shen , Nov 23

A technique for origin identification based on statistical analysis and LA-ICP-MS spectrometry.

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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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An in-depth look at the hidden world of gem inclusions.

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Book Review

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

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Congratulations to the readers who earned a perfect score on this year's Challenge quiz.

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