For a finishing touch to your sophisticated looks, slip on these exquisite vintage-styled black onyx stud earrings from Marc. A polished rectangular-cut black onyx is encased in a lifted sterling silver filigree frame. Marcasite crystal drops are added for a dazzling touch. Stone: Black onyx, marcasite. Metal: Sterling silver. Length: 1/2 inch. Width: 1/2 inch.