The relative hardness of the hard directions in diamond

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Abstract
A method is described of determining the relative hardness of the hard directions in diamond, using a micro-abrasion tester and diamond impregnated cutting wheels. Cube, dodecahedron and octahedron planes have been studied and an order of hardness established between the various directions on these planes. This order of hardness should also apply for ordinary diamond polishing when loose diamond powder is used on a flat scaife, although in this case the differences in hardness are very much greater.

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