Authentic Tiffany & Co. Heart Key Necklace – 18K Rose Gold – 16” This authentic Tiffany & Co. Heart Key necklace is crafted in luxurious 18 karat rose gold. The key pendant measures approximately 1” in length and is suspended from a 16-inch rose gold chain. The necklace has been professionally cleaned and polished and is in excellent pre-loved condition. It is gift-ready and will arrive with a new, authentic Tiffany & Co. box and pouch. A timeless and romantic Tiffany design, perfect for gifting or adding to your fine jewelry collection.