1.实验室培育的钻石在切工方面的对称性、比例和打磨等方面通常会比天然钻石更理想,因此,IGI证书可能更...
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Excellent(极好)Ideal(完美)Ideal是目前权威证书中最高等级的切工评价。被GIA所认定3EX切工的钻石中大概仅...
钻石切工的抛光级别也是五个等级EX(Excellent)、VG(Very good)、G(good)、F(faint)、P(poor)...