美国宝石学院

这颗水滴形钻石已经被美国宝石学院鉴定为D色和TypeIIA级，这意味着它的内部毫无瑕疵、切工完美，化学纯度达到顶级，并有着极佳的光学透明度。

The briolette has been graded by the Gemological Institute of America to be of D color and type IIa , indicating its internally flawless clarity , excellent polish , highest level of chemical purity and exceptional optical transparency .

一颗小鸡蛋大小的无瑕白色钻石以3000万美元的价格在香港拍卖会上成交，这颗118克拉的椭圆形钻石是美国宝石学院鉴定过的最重要的同类钻石。

A flawless white diamond , the size of a small egg , has sold for more than 30 million dollars at auction in Hong Kong , ( the ) 118-carat oval stone ranking as most significant such stone ever graded by the Gemological Institute of America .

美国宝石学院的西班牙宝石学家帕珞玛·桑切斯，为此亲身体验学习。

It was something that Paloma Sanchez , a certified GIA gemologist from Spain , had to learn through first-hand experience .