著名的希望钻石首次被采用公认的分级体系进行分级。尽管该钻石的重量已被肯定为45.52克拉,但美国宝石研究所宝石贸易研究室的质检人员发现其透明度应为VS_1(最近有报道称之为“近乎无瑕”),色级为“凡西深灰蓝色”。希望钻石在短波紫外光照射下发出耀眼的红色磷光。 For the first time, the well-known hope diamonds are graded using the accepted rating system. Although the weight of the diamond has been confirmed as 45.52 carats, the quality inspectors at the Gemological Research Laboratory of the Gemological Institute of the United States found that its transparency should be VS_1 (recently reported as “almost flawless”) and the color level is “Van West Dark gray blue. ” Hope that the diamond in the short-wave ultraviolet light emitted brilliant red phosphorescence.