A look at the gem ornamentation of this landmark, as well as the jewels of the Mughal dynasty.

Recently, a 2.05 ct blue sapphire was sent to Guild Gem Laboratories for identification.

Artificial glass, a low-cost material, is capable of simulating any gemstone owing to its range of appearances (bodycolor, transparency, and phenomena).

The Hong Kong laboratory recently examined a 14.36 ct pink-orange cushion mixed-cut specimen.

Resin materials marketed as imitation ivory were recently acquired by a GIA gemologist.

このジュエリーの画像コレクションは、金属加工の技法が宝石やジュエリーのデザインをいかに引き立てるかを紹介しています。

GIAの研究員が、稀少で美しいピンクダイヤモンドがどのように形成され、その色がどのように生じたかをよりよく理解するために9万以上もの天然ピンクダイヤモンドを分析しました。

米国のホリデー商戦の売上高予測は良好に見えます。サザビーズの香港オークションでは、GIAの卒業生の作品が出品されます。

米国の消費者信頼感は、経済が不況に陥るのを防ぎました。

大胆な大小のフラッシュ効果を示したり、極小の煌めきを素早く放つ軽やかなダンス。

隨著新的寶石處理方式及實驗室培育寶石流入市場，GIA 服務和儀器的重要性和影響力也越來越大。

米国務省は、宝飾業界に書類受け渡し記録の管理が十分に行われていないと報告します。

A 7.54 ct natural emerald containing a 3D helical inclusion is examined by the Tokyo laboratory.

Although opals generally contain water in their structure, fluid inclusions large enough to be resolved with the microscope are rare; those that can be seen with the unaided eye are exceedingly rare.

The interior structures of pearls are always of interest, as they are never revealed until the analysis begins.

Shows how the color of Madagascar sapphire is lightened with heating to relatively low temperatures below 1350°C.

Twelve pink sapphires undergo low-temperature heat treatment and reveal a correlation with the 3232 cm-1 FTIR peak.

Reviews the mining history, market impact, and properties of ruby from northern Mozambique near Montepuez, now the world’s most productive source.

Conclusively identifying the origin of a “hollow” pearl filled with foreign materials proves challenging.

Examines the basic characteristics of kimberlites and their relationship with diamonds.