How are Gems Cut and Polished Rausser College of
Grinding Grinding usually with silicon carbide wheels or diamond impregnated wheels is used to shape gemstones to a desired rough form called a with sawing a coolant/lubricant water or oil is used to remove debris and prevent overheating Very coarse diamond or silicon carbide such as 60 grit or mesh 400 micron particles or 100 grit 150 micron particles is used for