If you're looking for a simple yet sultry earring, look no more; the black onyx round drop earrings from Cordova is just that. The round black onyx hang from the diamonds for a truly elegant touch. These earrings are post back closure for pierced ears. Metal: 18k white gold. Stone: Diamond, onyx. Diamond weight: 0.18. Length: 1 inch. Width: 5/8 inch.