The quarterly journal of the gemological institute of america
EDITORIAL
Texas Topaz, Slovak Opal, a Beryl Inclusions Chart, and More
Duncan Pay, Editor-in-Chief
An overview of the Winter 2023 Gems & Gemology content.
Articles (5)
Topaz from Mason County, Texas
A comprehensive look at Texas topaz, detailing its gemological and compositional characteristics and providing a basis for using trace element concentrations to identify its origin.
Bohemian Garnets as Decorative Materials for Glass Vessels from the Late Sixteenth to Early Eighteenth Centuries
Examines a technique for setting cut garnets on glass objects, invented by Claudius vom Creutz of Nuremberg in the late sixteenth century.
A Unique Petrified Tree Fern from Northeast China
Documents the gemological properties, chemical composition, and appearance of petrified tree fern discovered in northeast China.
Slovak Opal: A New Life for a Historical Gem
Reports on the recent production of precious and common opal from a centuries-old locality.
Micro-Features of Beryl
Provides a visual guide to the internal features of different varieties of beryl.
Regular Features
GEM NEWS INTERNATIONAL
Global coverage of gem sources, notable new gem materials, and recent industry developments.
COLORED STONES UNEARTHED
Explores the geological concepts related to colored stone formation.
THE DR. EDWARD J. GÜBELIN
Most Valuable Article Awards
Methods and Challenges of Establishing the Geographic Origin of Diamonds
Evan M. Smith, Karen V. Smit, and Steven B. Shirey
A Canary in the Ruby Mine: Low-Temperature Heat Treatment Experiments on Burmese Ruby
E. Billie Hughes and Wim Vertriest
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