The modern elephant, threatened by extinction, is protected by international agreements banning the sale of ivory from tusks. This trade ban does not apply to ornaments made of mammoth fossil ivory, ...

一月生日石柘榴石是品种最丰富的宝石之一，因为它有许多不同的颜色。柘榴石生日石可在世界各地进行开采，象征着许多不同的乐观情绪。了解更多关于这种独特生日石的信息。 紫水晶是二月生日石，是石英的紫色类别，据说可以预防醉酒，让人在生意中保持 ...

Four similar-appearing yellowish green samples from Block D at Merelani, Tanzania, were identified as diopside and tremolite. The gems are identical in color, but their standard gemological properties ...

Studies carried out at the DTC Research Centre have shown that single-crystal CVD synthetic diamond is clearly distinguishable from natural diamond. This article presents information about the CVD ...

Figure 1. The largest known natural moissanite crystal, found along the Kishon River in northeastern Israel, measures 4.1 mm in its longest dimension. Photo by Vered Toledo. Synthetic silicon carbide ...

Twenty-six peridot samples from the Esquel pallasite meteorite and 27 samples from 10 terrestrial sources were studied by laser ablation–inductively coupled plasma–mass spectrometry (LAICP- MS). Among ...

GIA Student Workrooms give you affordable access to all the equipment and gemstones you need to complete the practical requirements of your Gem Identification course through Online Education. This ...

GIA Student Workrooms give you affordable access to all the equipment and gemstones you need to complete the practical requirements of your Gem Identification course through Online Education. This ...

宝石と宝飾品の仕事に興味のある学生に向けて、米国宝石学会は世界で最も人気のある教育プログラムを提供しています。 当校の学生たちは、自分のデザインアイデアに命を吹き込んだり、貴重なベンチスキルを学びたい、あるいは貴石の世界を深く ...

GIAの学生用ワークルームでは、オンライン教育を通して学ぶ宝石鑑別コースの学生が実技必修科目を修めるために必要となるあらゆる装置や宝石を手軽に利用することができます。20個の石鑑別の最終試験のための準備が必要な場合や監督者がいる試験を ...

This course covers how to describe diamond jewelry accurately for effective and ethical sales conversations with customers. Key topics examined include the internationally accepted GIA clarity grading ...

このコースでは、ダイヤモンド ジュエリーの販売に際し顧客と効果的に倫理観を持った会話ができるように、ダイヤモンド ジェリーを正確に説明する方法を学びます。主要な課題は、国際的に受け入れられているGIAのクラリティ グレーディング システム ...