Feature Gems & Gemology, Fall 1993, Vol. 29, No. 3

Two Near-Colorless General Electric Type-IIA Synthetic Diamond Crystals

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.