A ring is a round band, usually of metal, worn as ornamental jewellery. The term "ring" by itself always denotes jewellery worn on the finger; when worn as an ornament elsewhere, the body part is specified, e.g. earrings, neck rings, arm rings, and toe rings. Rings always fit snugly around or in the part of the body they ornament, so bands worn loosely, like a bracelet, are not rings. Rings may be made of almost any hard material: wood, bone, stone, metal, glass, gemstone or plastic. They may be set with gemstones (diamond, ruby, sapphire or emerald) or with other types of stone or glass. Although people wear some rings as mere ornaments, or as conspicuous displays of wealth, rings have symbolic functions in relation to marriage, exceptional achievement, high status or authority, membership in an organization, and the like. Rings can be made to sport insignia to be transferred in an impression in a wax seal, or outfitted with a small compartment in which to conceal things. In myth, fable, and fiction, rings are often endowed with spiritual or supernatural significance.