How are Gems Cut and Polished? - Rausser College of ...
2002-5-25 · Grinding. Grinding, usually with silicon carbide wheels or diamond-impregnated wheels, is used to shape gemstones to a desired rough form, called a preform.As with sawing, a coolant/lubricant (water or oil) is used to remove debris and prevent overheating. Very coarse diamond …
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