On the expression for diamond grit size it was indicated that limitations in defining diamond grit size by mesh alone and importance of defining diamond grit size by particles per carat(PPC).

• 在关于金刚石粒度的表示方式中,指出单纯以目数表示金刚石粒度的局限性和以每克拉颗粒数(PPC)表示金刚石粒度的重要性。