This is an authentic ROBERTO COIN 18K Yellow White Gold Diamond Nugget Pendant Necklace. The necklace is crafted of 18 karat yellow and white gold, and features.a hollow, organic nugget shaped pendant accented with pave diamonds, approximately .14 total carat weight, on a stylized link chain. The necklace also features the signature synthetic ruby set 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.