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 pendant lined with pave set diamonds and a fancy yellow diamond set in 18 karat yellow gold, with a total approximate carat weight of .44 carats. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.