White Gold Promise Ring is made from an alloy of gold with a mixture of nickel, zinc, copper, tin and manganese. Nowadays, white gold jewelry is sometimes rhodium-plated. The main reason was the white gold has been developed to imitate platinum during the Second World War. This was mainly because platinum was considered as a strategic material and was not allowed to be used in non military applications such as jewelry. White gold is now one of the first metal used in the manufacture of jewelry.