Lapidary machines are used by a lapidary, an artist who engraves, polishes, or cuts stones, minerals, and gemstones into cameos or faceted gems. A lapidary machine is an electronic machine that is basically a type of rock tumbler. The lapidary machines smooths the rough edges off of precious or semi precious stones. They also use resin or metal bonded diamond tooling to decrease the particle size until a polish is achieved. These are the procedures of tumbling, cabochon cutting, and faceting.