This is an authentic ROBERTO COIN 18K Yellow Gold Diamond .17ct Diamonds By The Inch Emerald Cut Necklace. The necklace is crafted of 18 karat yellow gold and features an emerald cut diamond, approximately .17 carat., and a synthetic ruby on the chain. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.