This is an authentic TIFFANY & CO Sterling Silver Pink Sapphire Square Stack Ring size 54, 6.75. This stunning ring is made of sterling silver and features a channel set square cut pink sapphire. 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.