Maintaining white gold rings is a bit trickier compared with caring for rings made of yellow gold or platinum. The reason has to do with how white gold is made: It consists of yellow gold mixed with white metals and covered with plating (usually rhodium) to hide the yellowish color of the resulting alloy.
White gold. Pure gold is combined with palladium and silver or with nickel, copper and zinc. Rhodium plating improves whiteness and durability. Green gold. Actually yellowishgreen in appearance, this is pure gold plus silver. Pink and rose. Increasingly popular, these reddish gold options are pure gold plus copper.