Item #: 600923 This is an authentic CARTIER 18K White Gold Pink Tourmaline Tank Ring size 48 or 4.5. The ring is crafted of 18 karat white gold and features a square pink tourmaline stone. Enjoy this sophisticated ring with the modern style of Cartier! Follow this item for alerts. Cartier is a registered trademark of Cartier. FASHIONPHILE is not affiliated with Cartier.