This is an authentic ROBERTO COIN 18K Yellow Gold Diamond .25ct Diamonds By The Inch Five Station Necklace. The necklace is crafted of 18 karat yellow gold and features five bezel-set round brilliant cut diamond stations weighing approximately .25 total carat weight, along with the signature synthetic ruby on the clasp. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.