Tiffany & Co. Lock Ring in Yellow Gold with Pavé Diamonds The Tiffany & Co. Lock ring is a bold symbol of unity and diversity, celebrating personal connections that shape us. Crafted in 18k yellow gold with round brilliant diamonds totaling 0.36 carats, this ring is a stylish choice whether worn alone or as part of your everyday ring collection. Details 18k Yellow Gold TTL Carat 0.36ct Size 6 Product Number: 72343786