Gold that is used in jewelry and dental fixtures is usually part pure gold mixed with other metals such as nickel, silver and copper. The amount of pure gold in any item such as jewelry is reflected by its karat value. Pure gold is 24 karat so to.
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Tips on Gold: Gold Filled Jewelry- Newer gold filled items have markings that indicate how much and what type of gold was used for the layer. means that the jewelry is at least gold by weight - Doug Mears says.