The Collaborative International Dictionary
lithoglyph
lithoglyph \lith"o*glyph\ (l[i^]th"[-o]*gl[i^]f), n. [Gr. liqoglyfi`a; li`qos stone + gly`fein to engrave.] An engraving on a gem.
Wiktionary
lithoglyph
n. An engraving on a gem.