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.
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。
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