Olympic Gold medals are required to be made from at least 92.5 % silver, and must contain a minimum of 6 grams of gold. All Olympic medals must be at least 60mm in diameter and 3mm thick. Minting the medals is the responsibility of the Olympic host. From 1928 through 1968 the design was always the same: the obverse showed a generic design by Florentine artist Giuseppe Cassioli of Greek goddess Nike with Rome 's Colloseum in the background and text naming the host city; the reverse showed another generic design of Nike saluting an Olympic champion.
what are the olympic gold medals made of
at least 92.5 % silver a minimum of 6 grams of gold