C. 1980. From our Estate collection, this 40x30mm oval black agate pin/pendant showcases masterful skill, featuring an intricately detailed … C. 1980. From our Estate collection, this 40x30mm oval black agate pin/pendant showcases masterful skill, featuring an intricately detailed cameo portrait inside a mosaic-style frame of carved onyx and mother-of-pearl. Finely crafted in polished 18kt yellow gold. Hinged bail fits up to a 7mm chain, sold separately. Revolver safety. Mother-of-pearl, onyx and black agate cameo pin/pendant. Exclusive, one-of-a-kind Estate Jewelry.