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

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.

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

Chronicles the history of this cultural landmark, originally assembled for the Prussian king between 1701 and 1714, and its reconstruction by the Soviet Union starting in 1979.

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

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

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

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

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.

Reveals the internal features and spectroscopic data of these small natural pearls and offers the means of separating them from pearls of related mollusk species.

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

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

Examines the color origin of color-change diaspore, known commercially as Zultanite, and compare the effectiveness of the chromophores it shares in common with corundum.

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.

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

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。