This is an authentic ROBERTO COIN 18K White Gold Diamond .16ct Pendant Necklace. The necklace is crafted of 18 karat white gold and features a single round brilliant cut diamond, weighing approximately .16 carat. The necklace also features a signature synthetic ruby stone set on the back of pendant. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.