This is an authentic TIFFANY Sterling Silver Enamel Knot Key Pendant Necklace in Blue. This lovely necklace is crafted of sterling silver and features a pendant in the form of a classic skeleton key with a knot pattern on the grip. This is a stunning necklace with a distinctive look, from Tiffany! Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.