This is an authentic TIFFANY & CO 18K Yellow Gold Twist Knot Pendant Necklace. This stunning necklace features a 18K yellow gold chain with a knot pendant. This is a spectacular necklace, for a one of a kind look, from Tiffany! Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.