lapidary n.

"one skilled in working with precious stones," late 14c., from Old French lapidaire "stonecutter," also "treatise on precious stones" (12c.), from Latin lapidarius "stonecutter," originally an adjective "of or working with stone," from lapis (genitive lapidis) "stone" (see lapideous). Meaning "a treatise on precious stones" is late 14c. As an adjective in English from 1724. Related: Lapidarist.