This is an authentic TIFFANY Platinum 18K Yellow Gold Yellow Diamond Crown Key Pendant Necklace. The necklace is crafted of platinum and features a crown key motif pave-set with round brilliant cut diamonds, approximately .26 total carat weight, and a single yellow diamond, approximately .18 carat. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.