News & Articles

Fall 2023 G&G Available Now

Erica Zaidman, November 3, 2023

An overview of the Fall 2023 Gems & Gemology content.

Figure 1. The 4.04 ct ring fashioned from a single-crystal CVD diamond. Photo by Towfiq Ahmed.

Solid Laboratory-Grown Single-Crystal Diamond Ring

Paul Johnson, Stephanie Persaud, and Madelyn Dragone, August 4, 2023

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

Summer 2023 G&G Available Now

Erica Zaidman, August 4, 2023

An overview of the Summer 2023 Gems & Gemology content.

Spring 2023 G&G Available Now

Erica Zaidman, May 23, 2023

An overview of the Spring 2023 Gems & Gemology content.

Figure 1. This 34.59 ct CVD-grown diamond (24.94 × 13.95 × 9.39 mm), produced by Ethereal Green Diamond in India, is the largest GIA has tested. Photo by Johnny (Chak Wan) Leung.

CVD Diamond Over 34 Carats Examined in GIA’s Hong Kong Laboratory

Ka Wing Tam and Terry “Ping Yu” Poon, May 3, 2023

A look at the largest CVD diamond GIA has encountered to date.

Figure 1. Suite of faceted nickel-diffused spinel (0.674–1.009 ct) showing the range of color from blue to bluish green. Photo by Aaron Palke and Diego Sanchez.

Color Modification of Spinel by Nickel (Ni) Diffusion: A New Treatment in the Gem Market

Michael Jollands, Abadie Ludlam, Aaron Palke, Wim Vertriest, Shiyun Jin, Pamela Cevallos, Sarah Arden, Elina Myagkaya, Ulrika D’Haenens-Johannson, Vararut Weeramongkhonlert, and Ziyin Sun, February 10, 2023

GIA researchers report on a new nickel-diffusion treatment used to modify color in spinel and present criteria for identification.

Fall 2023 Issue

Summer 2023 Issue

Spring 2023 Issue

Winter 2022 Issue

News & Articles

Fall 2023 Issue

Summer 2023 Issue

Spring 2023 Issue

Winter 2022 Issue

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