Evil eye jewelry is very popular in Greece, the Mediterranean world and certain parts of Central/South America. We do have an extensive variety of evil eye jewelry ranging from evil eye pendants to evil eye bracelets, magnets and other charms.
If you ever watched some of the old movies such as Troy, you'll note that there is an eye painted on the bow of the ship, meant to protect the warriors in battle and to bring them good luck. The mati, Greek for eye is supposed to protect one from someone else casting a glare of envy or harm your way. By wearing an eye, the superstition is that the eye turns away or repels the envy or harm, taking away bad luck and bringing you good luck.