Also lap·i·dist [ lap -i-dist]. /ˈlæp ɪ dɪst/. a worker who cuts, polishes, and engraves precious stones.

Also la·pid·ar·ist [l uh - pid -er-ist]. /ləˈpɪd ər ɪst/. an expert in precious stones and the art or techniques used in cutting and engraving them.

the art of cutting, polishing, and engraving precious stones.