The quarterly journal of the gemological institute of america
EDITORIAL
Nickel-Diffused Spinel, Vietnamese Augite, Brown Mammoth Ivory, and More…
Duncan Pay, Editor-in-Chief
An overview of the Summer 2023 Gems & Gemology content.
Articles (3)
Color Modification of Spinel by Nickel Diffusion: A New Treatment
Reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.
Gem-Quality Augite from Dong Nai, Vietnam
Offers a comprehensive look at a variety of augite from Dong Nai, Vietnam, detailing its formation and gemological characteristics.
Origins of Color in Brown Mammoth Ivory
Investigates the mineral and chemical compositions and surface morphology characteristics of brown mammoth ivory to identify the origins of its brown color.
Regular Features
GEM NEWS INTERNATIONAL
Global coverage of gem sources, notable new gem materials, and recent industry developments.
IN the SPOTLIGHT
A look at a rare volcanic glass from central Oregon with lapidary artist Tom Dodge.
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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