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

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.

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

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

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。

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

正在为特别的人挑选礼物吗？十二月生日石为每一种品味、风格和个性都提供了丰富选择 — 即使十二月并不需要庆祝生日也可以但挑无妨。

11 月 14 日，十件 Marie Antoinette（玛丽·安托瓦内特）的珠宝以及 90 件其他王室家族珠宝在苏富比日内瓦拍卖会上拍出了惊人的价格。

Abstracts of speaker presentations from the “Colored Stones and Pearls” session of GIA’s 2018 International Gemological Symposium.

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

Poster abstracts on “Gem Localities and Formation” from GIA’s 2018 International Gemological Symposium.