Editorial
Garnets, Sapphires, Opals, and Tarnish on High-Purity Gold
By Duncan Pay, Editor-in-Chief


An overview of the Winter 2015 Gems & Gemology content.

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Articles (5)

Formation
Formation

The Origin of Montana’s Alluvial Sapphires

By  J.C. (Hanco) Zwaan, Eric Buter, Regina Mertz-Kraus, and Robert E. Kane, Feb 1

Microscopic and chemical analysis may provide clues to the original source of Montana’s alluvial sapphires and help distinguish them from sapphires with overlapping properties.

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History
History

The Grand Sapphire of Louis XIV and The Ruspoli Sapphire

By  François Farges, Gérard Panczer, Nassima Benbalagh, and Geoffray Riondet, Feb 1

Archival research and gemological characterization reveal the true story of this 135.74 ct blue sapphire from the French crown jewels.

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Precious Metals
Precious Metals

Characterization of Tarnish Spots in Chinese High-Purity Gold Jewelry

By  Taijin Lu, Jian Zhang, Yan Lan, Ying Ma, Hua Chen, Jie Ke, Zhenglong Wu, and Miaomiao Tang, Feb 1

Examines the origin and nature of tarnish spots in high-purity gold and how they can be avoided.

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Localities
Localities

Splendor in the Outback: A Visit to Australia's Opal Fields

By  Tao Hsu, Andrew Lucas, and Vincent Pardieu, Feb 1

Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.

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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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Micro-World

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

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Book Review
Reviews

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

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Abstract
Letters

G&G readers respond.

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2015
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