lapidary (
http://definr.com/lapidary)
adj : of or relating to precious stones or the art of working with
them; "the ring is of no lapidary value"- Lord Byron;
"lapidary art"
n 1: an expert on precious stones and the art of cutting and
engraving them [syn:
lapidarist]
2: a skilled worker who cuts and engraves precious stones [syn:
lapidist]