Jewelry refers to ornamental devices worn by persons, typically made with gems and precious metals. Costume jewelry is made from less valuable materials. However, jewelry can and has been made out of almost every kind of material. Examples include bracelets, necklaces, rings, and earrings, as well as items like hair ornaments or body piercing jewelry. Jewelry, particularly when made with precious materials, is generally considered valuable and desirable. Some cultures have a practice of keeping large amounts of wealth stored in the form of jewelry. Jewelry can also be symbolic, as in the case of Christians wearing a crucifix in the form of jewelry, or, as is the case in many Western cultures, married people wearing a wedding ring.