A bullion coin is a coin struck from precious metal and kept as a store of value or an investment, rather than used in day-to-day commerce. Investment coins are generally coins that have been minted after 1800, have a purity of not less than 900 thousandths and are, or have been, a legal tender in their country of origin. Bullion coins are usually available in gold and silver, with the exception of the Krugerrand and the Swiss Vreneli which are only available in gold. The American Eagle series is available in gold, silver and platinum, and the Canadian Maple Leaf series is available in gold, silver, platinum and also palladium.

Bullion coins are also typically available in various weights. These are usually multiples or fractions of 1 troy ounce, but some bullion coins are produced in very limited quantities in kilograms and even heavier.

Bullion coins sell for a premium over the market price of the metal on the commodities exchanges. This is due to their comparative small size and the costs associated with manufacture, storage and distribution. The margin that is paid varies depending on what type of coin it is, the weight of the coin, and the precious metal. The premium also is affected by prevailing demand.

The simplest method for determining the bullion value of a precious metal coin is to multiply the actual precious metal weight by the current spot price for that metal. Using the example above, a silver coin with a 19.340 grams (0.6822 oz) actual silver weight would have an intrinsic value of € 7.85 when the spot price of silver is € 11.50. If the spot price of silver rose to € 17.95 that same coins intrinsic value would rise to € 12.25.