Olympic gold medals are not all gold and haven’t been since 1912. They are 1.34% gold, 92.5% silver and the rest is copper. Silver medals are also 92.5% percent silver, with the rest copper, and the bronze medals are 97% copper, 2.5% zinc and 0.5% tin.

London 2012 Olympic medals designed by British artist David Watkins

Olympic medals. Source: London 2012

Olympic Games 27 July – 12 August