The World’s Biggest Diamonds: Windows into the Earth’s Deep Mantle
Duncan Pay, Editor-in-Chief

An overview of the Winter 2017 Gems & Gemology content.

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Articles (6)


Gem Virtuosos: The Drehers and Their Extraordinary Carvings

Robert Weldon, Cathleen Jonathan, and Rose Tozer, Jan 26, 2018

A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.

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Akoya Cultured Pearl Farming in Eastern Australia

Laura M. Otter, Oluwatoosin B. A. Agbaje, Le Thi-Thu Huong, Tobias Häger, and Dorrit E. Jacob, Jan 26, 2018

Characterizes the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricate fucata mollusks.

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Chemical Composition
Chemical Composition

Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards

Jennifer Stone-Sundberg, Timothy Thomas, Ziyin Sun, Yunbin Guan, Zachary Cole, Randy Equall, and John L. Emmett, Jan 26, 2018

Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.

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Real-Time Microradiography of Pearls: A Comparison Between Detectors

Stefanos Karampelas, Abeer Tawfeeq Al-Alawi, and Ali Al-Attawi, Jan 26, 2018

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).

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Inclusions in Natural, Synthetic, and Treated Ruby

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley, Jan 26, 2018

Provides a visual guide to the internal features of natural, synthetic, and treated rubies.

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Regular Features

Lab notes
Lab Notes

The latest advances and findings from GIA laboratories.

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

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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

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

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Vote before Monday, March 19, 2018 for the Dr. Edward J. Gübelin Most Valuable Article Awards. Ballots will be entered in a drawing for a one-year print subscription to G&G.

Click here.

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