Summer 2024 - Volume 60, Issue 2

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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.
 

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Articles (4)

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Regular Features

Lab Notes

Lab Notes

The latest advances and findings from GIA laboratories.

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Summer 2024 Micro-World Banner

Micro-World

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

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Gem News

Gem News International

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

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Colored Stones Unearthed

Colored Stones Unearthed

Explores the geological concepts related to colored stone formation.

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Special Features

Left: A sci-fi scene in this oval measuring 48 × 72 × 8 mm and weighing 247 ct depicts streaks of light filtering through pine forests and reflecting in the lakes below. At the horizon, a giant moon emerges from behind the mountains. Photo by Robert Weldon. Right: Detail of variations in the perceived color, depending on the orientation of the light source. Photomicrograph by Nathan Renfro.

In the Spotlight

Artist Valentina Fetisova transforms labradorite cabochons into remarkable works of art.


THE DR. EDWARD J. GÜBELIN

Most Valuable Article Awards

MVA First Place

Yellow Sapphire: Natural, Heat-Treated, Beryllium-Diffused, and Synthetic
John L. Emmett, Ungkhana Atikarnsakul, Jennifer Stone-Sundberg, and Supharart Sangsawong

MVA Third Place

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