A lapiary (the word means "concerned with stones") is an artisan who practices the craft of working, forming and finishing stone, mineral, gemstones, and other suitably durable materials (amber, shell, jet, pearl, copal, coral, horn and bone, glass and other synthetics) into functional and/or decorative, even wearable, items (e.g. cameos, cabochons, and more complex faceted designs). The adjectival term is also extended to refer to such arts. Diamond cutters are generally not referred to as lapidaries, due to their highly specialized techniques which are required to work diamond successfully. The term Lapidist is used to describe the person who practices the art of lapidary, which may include cutting, carving,faceting or polishing rocks or gemstones.