This is an authentic ROBERTO COIN 18K Rose Gold Brown Diamond Blue Rutilated Quartz Cocktail Ring 53 6.25. The ring is crafted of 18 karat rose gold and features a blue rutilated quartz doublet framed by a halo of brown diamonds weighing approximately .48 total carat weight. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.