This is an authentic ROBERTO COIN 18K Rose Gold Diamond 4.25ctw Diamonds By The Inch Twenty-Five Station Necklace. The necklace is crafted of 18 karat rose gold and features twenty-five bezel-set round brilliant cut diamond stations weighing approximately 4.25 total carat weight, along with a synthetic ruby on the chain tag. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.