This is an authentic ROBERTO COIN 18K White Gold Diamond Tiny Treasures Key Pendant Necklace. The necklace is crafted of 18 karat white gold and features a key motif pendant pave-set with diamonds, approximately .20 total carat weight along with a synthetic ruby on the back. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.