bullion coin

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. The United Kingdom defines investment coins more specifically as 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 (those not meeting the last requirement are not "coins" according to United States law and must be advertised as "rounds" instead). Bullion coins are usually available in gold and silver, with the exceptions 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 palladium. Bullion coins are 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 or heavier.