Comparatively regular crystals shape, medium strength, belonging to medium and low grade, suitable for cutting tools and grinding wheels that medium and low load.
Comparatively regular crystal shape, high strength, containing some regular crystals, suitable for grinding and cutting tools, grinding wheels that work with medium load.
Comparatively regular crystal shape, high mechanic strength, belonging to medium grade, containing more regular crystal, suitable for grinding and free-cutting tools, grinding wheels which work with medium load.
Complete crystal shape with full surface, good diaphaneity and low impurity, high strength, suitable for circular saws, frame-saw and geological broaches.
Complete crystal shape, perfect cubic octahedron, good diaphaneity, high impact strength and thermal stability, suitable for high grade cutting, drilling and grinding tools.
Consistent crystal color, regular shape, good transparency, high strength and great thermal stability, applied to make tools for sawing all kinds of hard stone and concrete, also suitable for geological drills.