Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique
Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink color were examined for this report.

化学分析による斜長石長石の分離
化学に基づく長石の地理的起源を調べ、メキシコ産の素材が処理のために中国に送られ、中国の素材として販売されている主張を反駁します。 メキシコ、モンゴル、米国産のサンプルを分析します。
ジェレメジェバイト(エレミア石):ナミビア産の400 個の水晶コレクションの説明および予備的研究
ナミビア産と報告されている希少なジェレメジェバイト(エレミア石)は最近、研究目的でバンコクのGIAのラボに持ち込まれました。 この記事では、5個の試料の初期試験、および全コレクション写真についてご報告します。

Pearls with Unpleasant Odors
Two pearls were submitted for routine gemological identification at the GIA Laboratory in Bangkok and the work soon became both interesting and slightly uncomfortable as the pearls revealed an inner secret to the gemologists conducting the work.
加熱スピネルと非加熱スピネルの区別
最高品質の天然スピネルは、これまで大規模な処理プロセスを逃れてきましたが、いくつかの熱処理されたものが市販されています。 このレポートは、加熱スピネルの鑑別基準を設定します。
モザンビーク産と伝えられるルビー
モザンビーク北部産と報告される、魅力的な新ルビーがタイの宝石市場に登場し始めています。 この石はタンザニア・ウィンザ産のルビーに似ていますが、本研究の顕微鏡検査によって鑑別することができます。
The French Blue and the Hope: New Data from the Discovery of a Historical Lead Cast
With the use of modern tools and technology, this article sheds light on the history and provenance of both the French Blue and the Hope diamonds.
Purplish Pink Spinel from Tajikistan: Before and After Cutting
In November 2008, the Bangkok laboratory was fortunate to have an opportunity to briefly examine seven stones that the client had faceted from this parcel.
Demantoid from Val Malenco, Italy: Review and Update
New data are presented for demantoid from Val Malenco, Italy, as obtained by classical gemological methods.
熱処理の看破における二次的な液体インクルージョンの役割
非常に高い温度における二次的液体インクルージョン(「フィンガープリント」としても知られる)への影響および熱処理の看破におけるそれらの有用性について検討します。
Ruby and Sapphire Production and Distribution: A Quarter Century of Change
During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges.
The Wittelsbach Blue
This article describes what is known about the Wittelsbach Blue since it was first reported in 1666, and the gemological information released to date on this diamond.
Color Grading “D-to-Z” Diamonds at the GIA Laboratory
This article discusses the history and ongoing development of GIA's color grading system, and explains how its laboratory applies it.
タンザニア中央部、ウィンザ産のルビーおよびサファイア (英語)
Since late 2007, rubies and sapphires have been mined by hand methods from both eluvial and primary deposits at Winza in central Tanzania.
Aquamarine, Maxixe-Type Beryl, and Hydrothermal Synthetic Blue Beryl: Analysis and Identification
Aquamarine, Maxixe-type (irradiated) beryl, and two types of hydrothermally grown synthetic blue beryl currently available in the marketplace were investigated by classical gemological methods, chemical analysis, and UV-Vis-NIR and mid-IR spectroscopy.
Gota de Aceite(ゴータ・デ・アセイテイ): 最高級コロンビア産エメラルドの名称 (英語)
The finest and rarest emeralds are sometimes said to have an optical effect called gota de aceite.
The Color Durability of “Chocolate Pearls” by Ballerina Pearl Co.
Seven Chocolate Pearls supplied by Ballerina Pearl Co. and 12 untreated Tahitian cultured pearls (for comparison) were exposed to conditions of consumer care and wear.

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