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Jewelry stamped 24-karat is 99.9% pure gold and carries the most value by weight. Lesser karats are mixed with other alloys. Gold that’s 14-karat is 58.3% pure, for example.

Investment-quality gold bars should be at least 99.5% (995) pure gold. The rest is an alloy, usually silver or copper, that makes smelting possible.

Gold that’s 14-karat is 58.3% pure, for example. Gold coins and bars, often referred to as bullion, are popular items to sell. You may have some that you inherited or bought as an investment.