This is an authentic ROBERTO COIN 18K White Yellow Gold Diamond Large Siena Dot Pendant Necklace. The necklace is crafted of 18 karat white and yellow gold, and features a round pendant set with round brilliant cut diamonds, approximately .33 total carat weight. The pendant also features a synthetic ruby on its back. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.