Difference between gold bullion and gold proof sovereign?

A Proof coin is one that has been struck on specially prepared and polished dies and then the coin, after striking, is often hand polished to a mirror like finish. This type of coin is intended for serious collectors and investors and, not for circulation.

A Sovereign is a British coin made from gold with a nominal value of One Pound GBP. A gold Proof FDC Sovereign would be valued at a minimum of £100 GBP.

Gold Bullion is gold in the form of bars or ingots. Depending on the price of gold at any given time, the bullion value can exceed the collector value of a coin at times.

Most countries would ensure that the metal they make their coins from will never exceed the value of the coin.