The quarterly journal of the gemological institute of america
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.
Articles (5)
Characterization of Tarnish Spots in Chinese High-Purity Gold Jewelry
Examines the origin and nature of tarnish spots in high-purity gold and how they can be avoided.
Vanadium and Chromium-Bearing Pink Pyrope Garnet: Characterization and Quantitative Colorimetric Analysis
This type of pink pyrope garnet, believed to have been mined in Tanzania, shows a distinct color-change phenomenon resulting from its unique chemical composition.
Splendor in the Outback: A Visit to Australia's Opal Fields
Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.
The Grand Sapphire of Louis XIV and The Ruspoli Sapphire
Archival research and gemological characterization reveal the true story of this 135.74 ct blue sapphire from the French crown jewels.
The Origin of Montana’s Alluvial Sapphires
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.
Regular Features
GEM NEWS INTERNATIONAL
Global coverage of gem sources, notable new gem materials, and recent industry developments.
THE DR. EDWARD J. GÜBELIN
Most Valuable Article Awards
Sri Lanka: Expedition to the Island of Jewels
Andrew Lucas, Armil
Sammoon, A.P. Jayarajah, Tao
Hsu, and Pedro Padua
Exploring the Chinese Gem and Jewelry Industry
Tao Hsu, Andrew Lucas, Zhili
Qiu, Mu Li, and Qingyuan Yu
Three-Phase Inclusions in Emerald and Their Impact on Origin Determination
Sudarat Saeseaw, Vincent
Pardieu, and Supharart
Sangsawong
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