Hydrothermal synthetic red beryl has been produced for jewelry applications by the Institute of Crystallography and an affiliated company, Emcom Ltd., both in Moscow. Diagnostic identification ...

世界の二大ダイヤモンド生産企業、De Beers（デビアス）とAlrosa（アルロサ）は、この数ヶ月間で原石の売上げが激減したものの、現在のダイヤモンド市場は安定しており、米国のホリデー ...

Copper-bearing tourmaline from Mozambique was first recovered in 2001, but its Cu content was not recognized until 2003, and it was not widely sold with its Mozambique origin disclosed until 2005. It ...

Brazil is currently the leader in overall production of amethyst. This article describes the author's visits to three of Brazil’s most important mining areas: Marabá, Pau d’Arco, and Rio Grande do Sul ...

This large Australian light opal cabochon weighs 117.85 carats. Small play-of-color flashes of orange and green predominate in a pinfire pattern, with spots of a more muted blue over a grayish ...

アコヤ真珠、淡水真珠、南洋真珠、タヒチ真珠の品質を、世界有数の専門家がどのように決定しているかを学習します。GIA 7 Pearl Value Factors™（GIAの真珠の7つの評価要素™）について説明し ...

Akoya pearls are the small white pearls that most people picture when they think of pearls. They are saltwater pearls, and are usually round and white or cream, with a pink overtone and high luster.

Search a city or postal code to find retailers who carry GIA-graded diamonds or have GIA-trained staff. Results will include addresses, store hours and directions. Store hours reflected on Retailer ...

搜索城市或邮政编码，查找出售 GIA 分级钻石或有经过 GIA 培训的员工的零售商。搜索结果包括地址、营业时间和路线。 “查找零售商”列表上显示的营业时间可能不准确。建议联系各家商店 ...

GIAでグレードされたダイヤモンドのを取り扱う、またはGIAにより訓練を受けたスタッフのいる小売業者を、都市名またはや郵便番号で検索します。検索結果には住所と営業時間、そして ...

Reviews the advancements and major trends in laboratory-grown diamonds observed by GIA since 2007. Gemological and Trace Element Characteristics of Cassiterite from Yunling, China Examines gem-quality ...

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 ...