This is an authentic ROBERTO COIN 18K Yellow Gold Diamond Double Rectangular Pendant Necklace. The necklace is crafted of 18 karat yellow gold and features an open rectangular pendant set with round brilliant cut diamonds, approximately .22 total carat weight. The necklace also features the signature synthetic ruby on the back of the pendant. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.