ROBERTO COIN 18K Yellow Gold Diamond Love Letter P Pendant Necklace. The necklace is crafted of 18 karat yellow gold and features a "P" motif pendant pave-set with round brilliant cut diamonds weighing approximately .06 total carat weight, along with a synthetic ruby Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.