蝶結びは、その時代のスタイルを反映するために蘇って適応しながら、はるか昔のジュエリーやファッションにおいて人気のあるモチーフおよび最後の仕上げの手法として使われています。

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

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.

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.

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.

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.

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

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

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.

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.