Item #: 147909 This is an authentic TIFFANY & CO 18K Yellow Gold Ruby Stacking Ring, size 54 or US 7. This stunning ring is 18 karat yellow gold and features a central double layer of cut ruby stone. This is a stylish ring with a classic look, only from Tiffany & Co! Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.