In many cultures evil eye is a symbol of protection and good luck. Wearing jewlery with evil eye will protect you anywhere you are. Evil eye symbol often gets incorporated into bracelets, necklaces, earrings and rings. Typically for jewelry is used blue&white version of evil eye, but sometimes there are other colors used as well.
Placing an evil eye in your home as a part of interior decor helps to protect your space from all negative energies which come around or enter your home.