Generally, Degree of purity of ‘fitness’ of a Gold alloy is measured in Carat. For example 24 carat is pure gold. 22 Carat Gold comprises 22 parts of Gold and 2 parts of other impurities. Similarly, 18 Carat Gold has 18 parts of gold and 6 parts of other metals. In percentage terms, 18K gold is equal to 75% gold and the other 25% contains other metals such as Zinc, copper, silver etc.
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