Carat (mass) Despite its being a non-metric unit, a number of metric countries have used this unit for its limited range of application. The Board of Trade carat was divisible into four "diamond grains", but measurements were typically made in multiples of carat. There were also two varieties of "refiners' carats" once used in the United Kingdom — the pound carat and the ounce carat. The pound troy was divisible into 24 "pound carats" of 240 grains troy each; the pound carat was divisible into four "pound grains" of 60 grains troy each; and the pound grain was divisible into four "pound
Gold coin unveiled in 2012 by the Perth Mint in Western Australia. Known as the "1 Tonne Gold Kangaroo Coin" and with a face value of one million dollars, it contains one metric tonne of 9999 pure gold, and is approximately 80 cm in diameter by 12 cm thick. Other gold bullion coins, many named after their design features, include: Circulating gold coins were usually made of an alloy as other metals are mixed into the coin to make it more durable. Fineness is the actual gold content in a coin or bar and expressed as a "per mil", or thousandths. For