This is an authentic ROBERTO COIN 18K Yellow White Gold Diamond Collar Necklace. The necklace is crafted of 18 karat white gold and features a rigid collar fit half set with black and white diamonds in a tiny floral design, weighing approximately 4.40 total carat weight. The necklace also features the designer's synthetic ruby signature discreetly located near the clasp. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.