The quarterly journal of the gemological institute of america
EDITORIAL
Gems & Gemology at Ninety: Consistency and Change
James E. Shigley
An overview of the Summer 2024 Gems & Gemology content.
Articles (4)
Micro-Features of Tourmaline
Provides a visual guide to the internal features of tourmaline as well as tourmaline inclusions in other gem hosts.
Laboratory-Grown Diamonds: An Update on Identification and Products Evaluated at GIA
Reviews the advancements and major trends in laboratory-grown diamonds observed by GIA since 2007.
Gemological and Trace Element Characteristics of Cassiterite from Yunling, China
Examines gem-quality cassiterite from southwest China and analyzes trace element chemistry to distinguish it from Bolivian cassiterite.
Gem-Quality Anorthoclase Feldspar from Southeast Vietnam
Characterizes an anorthoclase variety of alkali feldspar found in southeast Vietnam and evaluates its potential for commercial use.
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.
Special Features
IN THE SPOTLIGHT
Artist Valentina Fetisova transforms labradorite cabochons into remarkable works of art.
THE DR. EDWARD J. GÜBELIN
Most Valuable Article Awards
Yellow Sapphire: Natural, Heat-Treated, Beryllium-Diffused, and Synthetic
John L. Emmett, Ungkhana Atikarnsakul, Jennifer Stone-Sundberg, and Supharart Sangsawong
Gemological Characterization of Montana Sapphire from the Secondary Deposits at Rock Creek, Missouri River, and Dry Cottonwood Creek
Aaron C. Palke, Nathan D. Renfro, Jeffrey R. Hapeman, and Richard B. Berg
Color Modification of Spinel by Nickel Diffusion: A New Treatment
Michael Jollands, Abadie Ludlam, Aaron C. Palke, Wim Vertriest, Shiyun Jin, Pamela Cevallos, Sarah Arden, Elina Myagkaya, Ulrika D’Haenens-Johannson, Vararut Weeramongkhonlert, and Ziyin Sun
Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning
Shiyun Jin, Aaron C. Palke, Nathan D. Renfro, and Ziyin Sun
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