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Fall 1993, Volume 29, Issue 3

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Two Near-Colorless General Electric Type-IIa Synthetic Diamond Crystals
James E. Shigley, Emmanuel Fritsch, and Ilene Reinitz


Gemological examination of two near-colorless, isotopically pure, carbon-12 synthetic diamonds grown recently by General Electric reveals short-wave ultraviolet luminescence behavior, a cathodoluminescence pattern, and small metallic inclusions that are typical of other gem-quality synthetic diamonds. These characteristics also help separate them from natural type-IIa diamonds. Study of additional near-colorless synthetic diamonds is needed to confirm these preliminary observations.

Appears on pages 191-197

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