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Winter 1994, Volume 30, Issue 4

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Colored diamonds are among the most intriguing and valuable gems. This issue presents, for the first time, a report on how the GIA Gem Trade Laboratory color grades colored diamonds. The diamonds here illustrate some of the exciting colors. They were provided by: American Siba, Cora Diamond Corp., U. Doppelt & Co., Ishaia Trading Corp., I. Wolf, L. Wolf, B. Zucker, and GIA GTL. Photo © GIA and Harold & Erica Van Pelt—Photographers, Los Angeles, CA.

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