You may not be surprised to learn that gold medals are not 100% gold, at least not anymore. When the Olympic Games first began, gold medals were composed of 100% gold. Unfortunately for modern Olympic athletes, that practice ended more than 100 years ago. Today, certain design and composition elements are chosen at the discretion of the Olympic organizing committee of the host city, but there remain certain standards that must be upheld no matter the venue. All gold medals must contain at least 6 grams of gold, gold and silver medals must be at least 92.5% silver, and all medals must have a minimum thickness of 3mm and minimum diameter of 60mm.
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