Item #: 67094 This is an authentic TIFFANY & CO 18k White Gold Green Tourmaline Stacking Ring 7.5. This stunning ring is 18 karat white gold and features a central double layer of cut green tourmaline crystals. This is a marvelous 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.