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Há 2 dias · Recently, the authors received a garnet sample originating from Thac Ba Lake in the Yen Bai province of Vietnam, obtained by a local miner. The 3.57 ct polished gem was pinkish white and reddish brown, translucent to opaque, and measured 7.11 × 6.90 × 6.40 mm. The diamond-shaped pinkish white portions were surrounded by reddish brown color ...
Há 4 dias · In March 2018, a GIA team traveled to Bridges Tsavorite’s Tucson office for a look at world-renowned gem cutter Victor Tuzlukov’s approach to cutting this rare gem. The 283.74 ct rough stone (figure 1) was mined by Bridges Tsavorite in Merelani, Tanzania, in September 2017.
Há 5 dias · GIA は、独自の画期的な研究から開発され、業界をリードする専門家が提供するカリキュラムを使って、世界でも有 数の宝石とジュエリーの教育を提供しています。. GIA の教育では、宝石やジュエリーに対する情熱をやりがいのある仕事へと繋げるために ...
Há 5 dias · Peridot Description. While the 64.57-carat cut peridot is magnificent, it is overshadowed by the amazing. 7.9-cm tall crystal. Both are from Sappat, Kohistan, Pakistan. - Jeffrey Scovil. Gem miners find peridot as irregular nodules (rounded rocks with peridot crystals inside) in some lava flows in the United States, China, and Vietnam and, very ...
Há 4 dias · His 1983 Gems & Gemology article describing the color nomenclature of orange-pink “padparadscha” sapphires is considered the authoritative explanation for these rare and highly prized specimens. Over a span of four decades, Crowningshield published more than a thousand brief observations in G&G ’s Lab Notes column, which he started in 1957.
Há 2 dias · Gem News International Gems & Gemology, Spring 2017, Vol. 53, No. 1 Ethical and Sustainable Vertical Integration in the Sapphire Market. Andrew Lucas and Tao Hsu
Há 3 dias · 跟随 GIA 实地宝石学家参观泰国复苏的矿区和宝石市场。. 在本视频中，您将跟随由 GIA 实地宝石学家 Vincent Pardieu（文森特·珀杜）带领的团队，参观泰国东部的一个蓝宝石矿和尖竹汶府繁华的宝石市场。. 该地区距离曼谷仅数小时路程，在那里很容易收集参考 ...
