Knowing what to look for in an unusual-looking coin is a helpful, but you are better off researching famous errors and how to spot them.

That's because rare state quarter errors can give these coins a higher value. Some can be worth thousands, so grab your magnifying glass and look for these beauties! Most Valuable State Quarter Errors ...

Coins with minting errors can be worth much more than their face value. A quarter honoring Georgia as part of the U.S. Mint's statehood quarters program sold for $10,000.

An expert has urged people to be on the lookout for an extremely rare British coin created this week that is already selling for £250. While this coin is not currently in circulation, it could ...

You can look here to see if your Georgia quarter is one of these rare coins. One of the most telling signs is a gold-green color on the coin as opposed to its normal, silver color.

A "first edition" Aquatics 50p coin from the London Olympics range could earn you more than £3,700 - here's the error to look for.

A rare 50p coin has sold for 600 times its face value on eBay Credit: EBay The extremely rare piece was one of 29 commemorative coins issued by The Royal Mint to celebrate the 2012 Olympics.

Errors are a common feature in valuable coins and can push values up to six figures or higher.