This is an authentic ROBERTO COIN 18K Yellow Gold Diamond Tiny Treasures Texas State Necklace. The necklace is crafted of 18 karat yellow gold and features a Texas map motif pave-set with diamonds, approximately .28 total carat weight, along with hidden a synthetic ruby Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.