镶嵌钻石4C分级的概念与技术

CONCEPTION AND TECHNIQUE OF SET DIAMOND GRADING

镶嵌钻石的品质分级可采用与裸钻相似但又有所不同的概念与技术。颜色分级可采用宝石显微镜配合的比色石支架的方法，净度分级可采用自背景技术消除映像的影响，对切工可采用目估评价的方法。对比性实验研究表明，应用上述技术方法，可使镶嵌钻石的品质分级达到相当高的可信度。

The accurate grading of set diamond is difficult, because the colour, clarity and cut have beeninfluenced by setting metal. This paper discusses the solution of this problem. By comparing the gradingresults of diamonds be fore setting with that of diamonds after setting. the author finds that, if we use asimple tool (a stand of colour masterstone), a new method of observation for clarity grading, we can getmuch more accurate result. The research states that, by using the new technique properly, the result ofcolour grading is almost the same accurate as that of diamonds unsetting, except extraordinary case theclarity grading of setting diamond is not influenced and the cut grading is only slightly influenced