Year: 2021 This is an authentic PIAGET 18K Rose Gold Diamond Black Onyx Possession Pendant Necklace. The necklace is crafted of 18-karat rose gold and features a polished black onyx orb and a round brilliant cut diamond, approximately .06 carat. . Follow this item for alerts. Piaget is a registered trademark of Piaget. FASHIONPHILE is not affiliated with Piaget.