White gold has a natural yellow undertone and is finished with a rhodium plating to enhance the white or silver color. This eventually wears off and shows this slight yellow shade. It also can be easily redone.
Platinum is naturally white, much heavier and does not need the plating. It is also non allergenic as there is no nickle in the metal. Being much more rare than gold and used in a nearly pure form, Platinum costs 3-5 times the price of gold.
Palladium is a great alternative to both platinum and white gold. It is a platinum group metal, stays white and is priced similar to 18 karat gold.
Chlorines and bleaches are very bad for your precious metals; they attack the alloy and cause discoloration and porosity, also removing rhodium and can damage many gemstones.
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