All legitimate diamonds of any value have a "unique" passport, a certificate grading the four Cs – colour, clarity, cut and carat.
所有合法销售的钻石不论价值几何都有一张“唯一的”通行证，这张证书对钻石的四个方面进行评级——色泽、透明度、切割和重量（克拉）。
The diamond is of the highest color grading for a white diamond and clarity ranking.
这颗钻石具有白钻石最高的颜色评级和净度。
The diamond is of the highest color grading for a white diamond and clarity ranking.
这颗钻石具有白钻石最高的颜色评级和净度。
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