This is an authentic ROBERTO COIN 18K White Gold Diamond 3.20ctw Diamonds By The Inch Station Necklace. The necklace is crafted of 18 karat white gold and features 20 bezel-set round brilliant cut diamond stations, approximately .3.20 total carat weight, along with a synthetic ruby on the chain tag. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.