The quarterly journal of the gemological institute of america
EDITORIAL
Brazil’s Enigmatic Diamonds, Cuprian Liddicoatite, and Silicon in Corundum
Duncan Pay, Editor-in-Chief
An overview of the Spring 2017 Gems & Gemology content.
Articles (6)
The Role of Silicon in the Color of Gem Corundum
Considers the previously unreported but critical impact of silicon on the coloration of gem quality sapphire.
Brazilian Diamonds: A Historical and Recent Perspective
Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.
Japanese Jadeite: History, Characteristics, and Comparison with Other Sources
Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.
Cuprian Liddicoatite Tourmaline
Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.
Causes of Iridescence in Natural Quartz
Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.
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Characteristics of Gem-Quality By-Product Synthetic Zincite
Investigates the properties of synthetic zincite produced by industrial kilns in Poland.
Regular Features
GEM NEWS INTERNATIONAL
Global coverage of gem sources, notable new gem materials, and recent industry developments.
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THE DR. EDWARD J. GÜBELIN
Most Valuable Article Awards
Jaipur, India: The Global Gem and Jewelry Power of the Pink City
Andrew Lucas, Nirupa Bhatt, Manoj Singhania, Kashish Sachdeva, Tao Hsu, and Pedro Padua
An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemology
Sally Eaton-Magaña and Christopher M. Breeding
Chart: Inclusions in Natural, Synthetic, and Treated Emerald
Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley
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