This is an authentic ROBERTO COIN 18K White Gold Diamond .36ct Diamonds by the Inch Pendant Necklace. The necklace is crafted of 18 karat white gold and features a single bezel-set diamond weighing approximately .36 carat, along with a synthetic ruby on the back. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.