ArticleFame.com | White Gold Can Get Yellow:
"Gold minded from the earth is a metallic mineral and is always a rich yellow color when refined. Pure gold is quite a rich color, quite soft and very malleable. For use in jewelry, gold must be made stronger. Strength is added by making gold part of a recipe(alloy) of metals. Generally, the basic metals added to pure gold are silver and copper. Small amounts of other metals are added to make a gold alloy to serve a specific purpose with special working qualities. Once made into an alloy, gold becomes the karat gold with which we are familiar: 10k, 14k, and 18k. "
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