Cartier gold ring can be maintained by coating a layer of transparent nails on the surface of the ring, which can prevent the ring from being oxidized. If white spots have appeared on the surface, they will disappear completely after burning with alcohol lamp. Cartier platinum ring can be cleaned with toothpaste, which can remove most dirt and restore luster. If the Cartier ring has been worn for more than six months, you must go to a regular jewelry store for cleaning and nursing.