Mainly complete hexahedron or octahedron and equal volume shape, crystal shape is symmetrical and regular, diamond internal inclusions and bubbles and other impurities are small, particle size is accurate, color is yellow, and transparency is good.

It is used to remove the drill and clean the dead skin on the edge of the nail.

High hardness / wear resistance / not easy to wear, Scope of application: all kinds of metal/jade/wood/cast iron/cast steel/copper/aluminum/marble/jade, etc.