Modern Diamond Cutting and Polishing
Modern Diamond Cutting GEMS & GEMOLOGY Summer 1997 103 scale), diamond is also one of the most diffi-cult gem materials to facet. 2. Although diamond is optically isotropic (i.e., it has only one refractive index), its hardness varies with crystallographic orien-tation, such that it can only be polished in certain crystallographic directions. These
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