Item #: 664981 This is an authentic TIFFANY 18K Yellow Gold Diamond Heart Lock Pendant Necklace. The necklace is crafted of 18 karat yellow gold and features a heart motif pendant pave set with round brilliant cut diamonds, approximately .36 total carat weight. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.