Authentic TIFFANY & CO 18k Gold Citrine Sparklers Cocktail Ring 5.5. This stylish ring is crafted of 18 karat gold featuring a cushion cut citrine. The setting is engraved "Tiffany & Co." This is a marvelous ring for an unforgettable look only from Tiffany & Co. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.