Traditionally nickel was used in white gold, however, nickel is no longer used in most white gold made today as nickel can cause reactions with some people. We do not use nickel in our white gold.
When white gold rings are new they are coated with another white metal called Rhodium. Rhodium is a metal very similar to platinum and Rhodium shares many of the properties of platinum including its white color.
The rhodium plating is used to make the white gold look more white. The natural color of white gold is actually a light grey color. The Rhodium is very white and very hard, but it does wear away eventually. To keep a white gold ring looking its best it should be re-rhodium plated approximately each 12 to 18 months. Most local jewelers are able to rhodium plate jewelry for a cost effective price.
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"Yellow gold is made by mixing pure gold with alloy metals such as copper and zinc.
Rose gold is made using a mix of pure gold with alloys including copper. The copper provides the rose-reddish color.
White gold is an alloy of gold and some white metals such as silver and palladium."
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Since gold is too soft to make jewelry by itself, manufacturers blend pure gold with other metals before shaping it into jewelry. It is an alloy which is simply a mixture of two or more metals that is very durable and attractive. The qualities of it make it ideal for several uses, especially in creating jewelry for both men and women.