Surprisingly, diamonds do not all form in the same way, but rather they form in various environments and through varying mechanisms.

Provides a visual guide to the internal features of natural, synthetic, and treated diamonds.

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.

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

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

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

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

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.

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.

Held October 21 and 22 at Cinema Row, the Chicago Responsible Jewelry Conference drew 200 attendees who heard industry experts discuss safe, sustainable, ethical gem production and jewelry design.

In recent months, sapphires treated under heat and pressure have been documented in the trade.

A pink synthetic moissanite is coated with a thin colored film, raising questions about the natural origin of its color.

A rough sample submitted as diamond is proven to be a synthetic moissanite with a thin diamond coating.

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

Single HPHT laboratory-grown diamond identified in a ring containing 194 natural diamonds.

Review of Narrative Jewelry: Tales from the Toolbox by Mark Fenn.

新的图解宝石指南帮助小规模手工矿工进一步了解他们发掘的宝石的品质和等级。