Pietra Dura Pendant,

floral decor, oval, 14k yellow gold, 1 1/8" x 7/8", circa 1890. n. Hard and fine stones in general, as used for inlay etc. and distinguished from the softer stones used in building.Hard and fine stones in general, such as are used for inlay and the like, as distinguished from the softer stones used in building; thus, a Florentine mosaic is a familiar instance of work in pietra dura, though the ground may be soft marble.