This is an authentic ROBERTO COIN 18K White Gold Diamond Mother of Pearl Quartz Margherita Pendant Necklace. The necklace is crafted of 18 karat white gold and features a round, ornate pendant set with a mother of pearl and quartz doublet and approximately 1.59 total carat weight of black, grey and colorless diamonds. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.