Lucky Penny

A Lucky Penny is a coin made entirely or partially, out of leprechaun gold, and has a slightly greenish tint. It bestows the bearer with good luck in their endeavors. The more leprechaun gold, the stronger the luck of the coin.
Interestingly, anyone who forges a lucky penny has their luck become tied to it, and if they lose possession of the penny, they become exceedingly unlucky, to the point of death.