human
I've heard that there are different types of gold coins. What are they?
assistant
There are many different types of gold coins, such as bullion bars, rounds, and numismatic coins. Bullion bars are typically made up of a combination of gold and silver. Rounds are flat discs with a diameter between 8 and 22 millimeters. Numismatic coins are usually in the shape of a coin or token and have a denomination on them.