An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.

A rare mineral acquired along the Thai-Myanmar border exhibits the distinctive six-spoke pattern associated with trapiche.

A lighting method modified for gemological microscopy provides false-color contrast to enhance inclusion scenes.

Bangles submitted for identification are found to be not jadeite jade, but hydrogrossular garnet, an unusual choice for this form.

A Fancy Intense purplish pink diamond with a network of planar cracks and strain-induced bodycolor reveals an aesthetic geometric pattern.

A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.

Advancing CVD growth technologies yield intensely colored, high-quality synthetic diamonds, such as the two green-blue synthetic materials seen in the New York lab.

An unusual host-inclusion association is revealed when a cluster of crystals in a colorless topaz is discovered to be molybdenite.

An assembled mabe pearl contains a fluted object, the function of which is unknown.

Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.

A technique for origin identification based on statistical analysis and LA-ICP-MS spectrometry.

Explores the history, geology, and current production of this unique source of large diamonds.

Examines a new source of colorless and near-colorless gem-quality HPHT synthetic diamonds using spectroscopic and gemological analysis.

Review of Maker & Muse, Women of the 20th Century Art Jewelry, by Elyse Zorn Karlin.

Review of Mineral Treasures of the Ozarks, by Bruce L. Stinchcomb.

Review of Bright Lights in the Dark Ages: The Thaw Collection of Early Medieval Ornaments by Noël Adams

Review of Treasures from India: Jewels from the Al-Thani Collection by Navina Najat Haidar and Courtney Ann Stewart.

Colombia’s unique trapiche emeralds exert a fascination for many gemologists.

GIAのフィールドジェモロジストと共に、マダガスカル、ケニア、タンザニア、ザンビア、そしてモザンビークの宝石鉱区を訪れましょう。

G&Gブリーフでは、Gems & Gemology（宝石と宝石学）2015年秋号の内容の概要を紹介しています。