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.

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.

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

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.

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.

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

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.

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

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

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.

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

イラスト入りの新しい宝石ガイドは、小規模の採掘職人が自ら採鉱した宝石の品質と分類について詳しく学ぶのに役立ちます。

World-class fancy colored diamonds and truly historic jewels highlighted the 2018 auctions, but total jewelry sales were down from 2017.

大切な方に贈るギフトをお探しですか？12月の誕生石は、その方が12月生まれでなくても、すべての方の好み、スタイル、個性にピッタリ合ったギフトとなります。

マリー・アントワネットの宝飾品の10点が、11月14日に行われたサザビーズのジュネーブオークションで王室のその他の宝石90点と共に驚異的な価格で落札されました。

自然は秋になると、鮮やかなパレットのように変わる木の葉の色や万華鏡のように色鮮やかな素晴らしい夕日を見せてくれます。