金刚石硬度很高,因而是现代化建设中重要材料之一。金刚石价格昂贵,一粒0.3～0.4克(1.5～2克拉)的一级工业金刚石价值1650～2200元。目前我国所用的金刚石大部份靠进口,所以,合理地使用这种贵重材料,在大量节省外汇的同时,也促进与金刚石(?)具有关工作的进展。金刚石晶体同其他晶体一样,其硬度具有方向性,即在不同晶面的不同方向上硬度是不同的。在刀具的制造中,将金刚石的最大硬度 Diamond hardness is high, so it is one of the important materials in the modernization. Diamond expensive, a 0.3 to 0.4 grams (1.5 to 2 karats) of an industrial diamond worth 1650 ~ 2200 yuan. At present, most of the diamonds used in our country are imported. Therefore, the rational use of such precious materials will greatly facilitate the progress of diamond-related work while saving a great deal of foreign exchange. Diamond crystals, like other crystals, have a hardness that is directional, ie, the hardness varies in different directions across different crystal planes. In the manufacture of tools, the maximum hardness of diamond