Editorial
Visit Europe’s First Diamond Mine
Duncan Pay, Editor-in-Chief


An overview of the Summer 2017 Gems & Gemology content.
 

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Articles (7)

Formation
Formation

Carbonado Diamond: A Review of Properties and Origin

Stephen E. Haggerty, Aug 7, 2017

Presents a detailed examination of about 800 samples of carbonado diamond from Brazil and the Central African Republic, including possible models for its genesis.

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Identification
Identification

Photoluminescence Mapping of Optical Defects in HPHT Synthetic Diamond

Lorne C. Loudin, Aug 7, 2017

Demonstrates the importance of this method in identifying diamond treatments, based on the analysis of PL maps acquired from a brownish orange HPHT synthetic diamond.

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Localities
Localities

An Update on Tourmaline from Luc Yen, Vietnam

Nguy Tuyet Nhung, Le Thi Thu Huong, Nguyen Thi Minh Thuyet, Tobias Häger, Nguyen Thi Le Quyen, and Tran Thi Duyen, Aug 7, 2017

Reviews the characteristics of tourmaline from pegmatites in the Luc Yen district of northern Vietnam.

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Color
Color

Characterization of Mg and Fe Contents in Nephrite Using Raman Spectroscopy

Xiaoyan Feng, Yong Zhang, Taijin Lu, and Hui Zhang, Aug 7, 2017

Evaluates the usefulness of Raman spectroscopy in distinguishing the color varieties of nephrite based on the relative ratio of Mg to Fe concentration.

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Gemology
Gemology

Inclusions in Natural, Synthetic, and Treated Sapphire

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley, Aug 7, 2017

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

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Localities
Localities

Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits

Tao Hsu, Andrew Lucas, Robert E. Kane, Shane McClure, and Nathan Renfro, Aug 7, 2017

Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.

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Regular Features

Lab notes
Lab Notes

The latest advances and findings from GIA laboratories.

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Micro-World

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

View All (8)
Gem News
Gem News International

Global coverage of gem sources, notable new gem materials, and recent industry developments.

View All (9)
Book Review
Reviews

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

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THE DR. EDWARD J. GÜBELIN
MOST VALUABLE ARTICLE AWARD

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

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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