This is an authentic ROBERTO COIN 18K Yellow Gold Diamond Tiny Treasures Initial O Pendant Necklace. The necklace is crafted of 18 karat yellow gold and features a dainty chain holding a round brushed disc with a diamond O weighing approximately .06 total carat weight. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.