... RVD powder. green RVD powder: There are some metal in the diamond. yellow RVD powder: It is impurity-less ... lowest grade diamond, suitable for using in loose form, compounds and slurries, or in resin bond tools and metal bond ... lowest grade diamond, suitable for using in loose form, compounds and slurries, or in resin bond tools and metal bond ... 30/40,20/30,18/20,16/18 high purity synthetic diamond powder