Research Article Search Results

Explains the reactions responsible for the formation of a well-developed reaction rim of spinel that surrounds the corundum core in some specimens from this deposit.

Unusually large prismatic pargasite inclusions observed in a Kashmir sapphire submitted to the Carlsbad lab for origin determination.

Lightbox, a De Beers company, has begun selling “white,” pink, and blue CVD laboratory-grown diamonds at a flat rate of $800 per carat.

Chatoyant vivid blue Brazilian tourmaline is examined in the Bangkok lab.

An exceptional ruby specimen is identified with a Montana origin in the Carlsbad lab.

Three freshwater pearls, two blister and one loose, were examined in the New York lab.

In the early 1960s, French ceramist and engineer Pierre Gilson succeeded in growing and producing flux synthetic emerald of commercially marketable quality.

Garnets have been known since antiquity. However, it was only during the late nineteenth century that the green variety demantoid—named for its “diamond-like” luster—was discovered in the Ural Mountains of Russia.

Garnets have been known since antiquity. However, it was only during the late nineteenth century that the green variety demantoid—named for its “diamond-like” luster—was discovered in the Ural Mountains of Russia.

The presence of these zircon clusters might help separate Ethiopian sapphire from other basalt-related sources.

Summarizes data collected by GIA on more than 90,000 natural diamonds in this color range and presents their gemological and spectroscopic properties.

Examination of a type IaB diamond that exhibited instantaneous 2803 cm–1 FTIR absorption shortly after exposure to an ultra-short-wave UV source.