
Three Occurrences of Oregon Sunstone
Chronicles a visit to the high desert of eastern Oregon to examine commercial sources of this natural copper-bearing feldspar.

The Museum of London’s Extraordinary Cheapside Hoard
The history and mysteries behind a treasure of jewels hidden during the 1600s, a window to the past being fully opened to the public for the first time since a chance discovery a century ago.




「より豊かなことは、より豊かなこと」のバーチャルツアーを体験する
GIA博物館の展示「より豊かなことは、より豊かなこと:Tony Duquette-Hutton Wilkinson(トニー・デュケット-ハットン・ウィルキンソン)の宝飾品 」は、有名なハリウッドのデザイナーによる宝飾品を披露しています。

炭化ホウ素:ブラックダイヤモンドの新たな模造石
Specimen sold as black diamond identified as ceramic material commonly used in hard-plating applications

合成ダイヤモンド:そこにはどれくらいありますか?
小包の非公開合成石が宝石学ラボによって特定されたという報告は、宝石市場に多くの合成石が紛れている可能性があるとの新たな疑問が浮上しました。ただしそれには反対の意見も多くあります。

MilaがGemfields社のエメラルド売込みに拍車を掛ける
GIA senior industry analyst Russell Shor spoke with Ian Harebottle, the CEO of Gemfields, a large, publically held gemstone mine, about the company’s efforts to use advertising and promotions to lift the entire industry.

Integrating G&G with GIA’s Gemology Education
This is the editorial article for the Summer 2013 issue of Gems & Gemology
Optimizing Face-Up Appearance in Colored Gemstone Faceting
How contrast patterns can increase perceived brightness and optimize a gemstone's appearance.
ダイヤモンド中の光学的欠陥:早見表 (英語)
A simple chart on optical defects in diamond, including those that produce coloration and fluorescence colors.

Fluorescence Produced by Optical Defects in Diamond
How variations in UV lamp output can affect observed fluorescence color and intensity.
Nephrite Jade from Val Malenco, Italy: Review and Update
Analysis of 21 rough and gem-quality samples offers an update on the composition and properties of this pale green gem from the Italian Alps.
Orangy Pink Coated "Soft Coral"
A coral specimen that was coated—not dyed—with a coloring agent only on the surface, an unusual method evidenced by microscopic features.
ファンシーイエロー・ケープダイヤモンドの中に魚のような内包物を発見 (英語)
A recent lab examination at GIA New York revealed an inclusion in a rectangular Fancy Yellow called "pareidolia," which means it was a resemblance of the scales and form of a fish.
Rare Faceted Neptunite
Raman spectroscopy reveals orangy red neptunite in identification of a 11.78 ct faceted “black” octagonal modified step-cut stone.
ボツワナ:選鉱事業の進展
ボツワナでは、3,000名近くの労働者が、輸出用ダイヤモンドのカットや研磨を行っています。昨年の収益は8億ドル(約800億円)近くで、2015年までには10億ドル(約1000億円)に達しようとしています。 研磨作業のすべてではありませんが、多くの収益性は高く、そうでないものも収益拡大へと大きな進歩を遂げています。

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