Many factors determine the value of a gold coins, such as its rarity, age, condition and the number originally minted. Gold coins coveted by collectors include the Aureus, Solidus and Spur Ryal. Other than collectors' gold coins, gold bullion coins are popular amongst people who desire a "hedge" against inflation or a store of value. Gold bullion coins usually come in 1 oz, 1/2 oz, 1/4 oz, 1/10 and 1/20 oz. sizes. A 1/10th oz bullion coin is about the same size as a U.S. dime. A 1 oz. gold bullion coin is about the size of a U.S. half dollar.
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