Exceptions to the rule of face value being higher than content value also occur for some bullion coins made of copper, silver, or gold, intended for collectors or investors in precious metals. Historically, a great quantity of coinage metals (including alloys) and other materials (e.g. porcelain) have been used to produce coins for circulation, collection, and metal investment: bullion coins often serve as more convenient stores of assured metal quantity and purity than other bullion.

These coin rings are made from bullion or other non-currency tokens.