Year: 2020 This is an authentic ROBERTO COIN 18K Yellow Gold Diamond Black Onyx Butterfly Pendant Necklace. The necklace is crafted of 18 karat yellow gold and features a butterfly pendant set with black onyx and a single diamond weighing approximately .03 total carat weight. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.