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Gemological Institute of America
21h
Graduate Colored Stones Online Diploma
Students explore more than 60 species of common and collector gemstones found in the marketplace. Subjects covered include the GIA Colored Stone Grading System, gemstone formation, composition, ...
Gemological Institute of America
1d
オパール: 銀河を秘めた宝石
すべてのGIA拠点でご利用可能。 マラウイ産のブルージルコンが報告される マラウイで新たにブルージルコンの産出が報告されました。研磨すれば美しい宝石となる原石を宝石取引市場に ...
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