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The difference between 14k and 18k gold necklaces lies in the amount of pure gold they contain. 14k gold necklaces are made up of 58.3% pure gold and 41.7% other metals, such as copper and silver. On the other hand, 18k gold necklaces are made up of 75% pure gold and 25% other metals. This makes 18k gold necklaces more valuable and expensive than 14k gold necklaces.
For gold-plated necklaces, gold purity is primarily used to describe the gold plating. The inner metal is usually silver or brass.