Gold Troy Ounce and bullion coins

Bullion coins" - such as Krugerrands, British Sovereigns and Canadian Maple Leafs are made from Silver, Gold or Platinum - and have been made at specific sizes in order to contain an exact amount of precious metal. A classic example are the United States Platinum "Eagles" - and these contain one Troy Ounce of "fine" (i.e. at least 99.9% pure) platinum.

Typically, modern bullion coins will state the amount of precious metal they contain in Troy Ounces, for example saying something like "one ounce fine gold" - but this will not necessarily mean that the coin itself weighs exactly an ounce. Krugerrands are made from 22 carat gold - 91.667% pure - and as such are made heavier than one ounce in order to contain exactly one Troy Ounce of gold. This can be slightly confusing - they are not made only of "fine gold" but contain exactly one ounce of "fine gold