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.

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.

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.

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

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。

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。

A recap of the Futurescape Forum panel from GIA’s 2018 International Gemological Symposium.

Poster abstracts on “New Technologies and Techniques” from GIA’s 2018 International Gemological Symposium.