本文件规定了用于评分的术语、分类和方法 以及超过0.25克拉（克拉）的单颗未安装抛光钻石的说明。 本文件适用于天然、未安装、抛光钻石。它不是用来幻想的 彩色钻石、合成钻石、处理过的钻石（7.4中允许的除外），也不适用于 组装好的石头。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies the terminology, classification and the methods that are used for the grading and description of single unmounted polished diamonds over 0,25 carat (ct). This document applies to natural, unmounted, polished diamonds. It is not to be used for fancy coloured diamonds, synthetic diamonds, treated diamonds (other than is allowed for in 7.4), nor for assembled stones.All current amendments available at time of purchase are included with the purchase of this document.