A specific error across Queen Elizabeth II's portrait means this coin could be worht 100 times its face value.

Errors increase the value of collectibles because a limited number go into circulation before it is spotted and corrected.

Take a sec to give that state quarter a second look before you drop it in the parking meter or vending machine. There are tons of statehood quarters out there, but some of them are worth way more than ...

As with just about any asset, a coin’s value is determined by its market demand. This means that coins in short supply often see higher demand — and higher values. With coins, supplies are limited ...