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The Gold Karat Mark. . . The Key to Understanding the Value of Gold JewelryAll gold is not created equal. Identical rings offered in both 12-karat and 18-karat gold. . . the 18-karat ring has fifty-percent more of the precious metal than the 12-karat ring. A 10-karat piece of jewelry has less than fifty-percent gold in the metal that is used. The measurement of the fineness or percentage of gold in a metal is a karat--abbreviated K. Pure gold--100 percent gold--is 24 karats. All alloys (the combination of gold and other metals) are calculated based on the 24 karats. So, if you are buying an 18K ring, you are purchasing 18 parts gold and 6 parts other metals. Gold less than 10-karat (41.67% gold) cannot be legally called "gold" in the United States. Karat Gold Fineness
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