The quarterly journal of the gemological institute of america
EDITORIAL
The Beauty of Natural Green Diamonds
Duncan Pay, Editor-in-Chief
An overview of the Spring 2018 Gems & Gemology content.
Articles (3)
Natural-Color Green Diamonds: A Beautiful Conundrum
Characterizes diamonds with exceptionally rare natural green color, based on GIA’s extensive database of samples.
Iridescence in Metamorphic “Rainbow” Hematite
Analyzes the substructures that cause the intense iridescence observed in “rainbow” hematite from Minas Gerais, Brazil.
DNA Techniques Applied to the Identification of Pinctada Fucata Pearls from Uwajima, Ehime Prefecture, Japan
Shows how genetic material extracted from small amounts of pearl powder can be a useful indicator of this akoya cultured pearl species.
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 AWARD
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits
Tao Hsu, Andrew Lucas, Robert E.
Kane, Shane F. McClure, and
Nathan D. Renfro
Colombian Emerald Industry: Winds of Change
Darwin Fortaleché, Andrew Lucas,
Jonathan Muyal, Tao Hsu, and
Pedro Padua
Characterization of Mg and Fe Contents in Nephrite Using Raman Spectroscopy
Xiaoyan Feng, Yong Zhang, Taijin
Lu, and Hui Zhang
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