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WebDiamonds that are 0.75 carats and smaller, can have a polish grade of Fair or better since the polish will not adversely impact the appearance of the diamond to an untrained observer. A polish grade of Poor should be … WebNov 24, 2015 · The 31.06 ct. Wittelsbach-Graff is one of the largest historic blue diamonds ever fashioned. Blue diamonds are extremely rare. The presence of boron impurities is often responsible for the color of natural … WebRT @SheilaKhama: DiamondFacts💎BW 4 a cost of about $82m, De Beers designed, built & equipped the DTCB💎sorting & valuing facility commissioned in 2008. Part of Jwaneng mining lease agreement. Equipment propriety to De Beers, designed in London based laboratories for own exclusive in🇧🇼🇿🇦 &🇳🇦 ops. first bank ahmad bin sultan issa