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Há 3 dias · Acquista o vendi oggetti nell’Asta di diamanti esclusivi (IGI GIA) · senza prezzo di riserva di Catawiki. All’asta questa settimana: Senza Prezzo di Riserva - 1 pcs Diamante (Naturale) - 1.11 ct - Smeraldo - D (incolore) - IF - International Gemological Institute (IGI) - *EX* *Leggero*.
2 de nov. de 2023 · And of all the 4Cs, it is the most complex and technically difficult to analyze. The GIA Cut Grading System for the standard round brilliant diamond evaluates seven components. The first three, brightness, fire, and scintillation, consider the diamond's overall face-up appearance. The remaining four, weight ratio, durability, polish, and ...
31 de jul. de 2015 · This 12.61 ct blue sapphire and 7.90 ct orange sapphire recently mined by Potentate show that large material still comes out of Rock Creek, Montana. Photo by Eric Welch/GIA, courtesy of Potentate Mining. Potentate Mining marketing director Warren Boyd presented two magnificent sapphires (figure 1) and a suite of fancy sapphires extracted from ...
Há 4 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 2 dias · Figure 3. Left: Some prefer tsavorite garnets with a brighter color, while others prefer a darker appearance. The stone on the left weighs 9.50 ct. Right: This suite of three pear-shaped tsavorites totals 37.79 carats. The approximate asking price for such fine gems would be about $15,000 per carat.
Há 4 dias · GIAのフィールドジェモロジストとともに、世界で最も鮮やかなブルースピネルを探し求めてベトナムの石灰岩の山へ出かけましょう。. GIAのフィールドジェモロジィ部門が作成したこの新しいビデオでは、スカイブルーのスピネルを求めてベトナムの ...
Há 3 dias · GIAは30年以上にわたり、ラボラトリー グロウン ダイヤモンドすなわち人工ダイヤモンドについて広範囲に研究を進めてきました。このため、このようなダイヤモンドの製造方法や鑑別方法について多大な知識を有してい ...
