Stud earrings are a kind of ear jewelry made up of a small component that fits onto the earlobe and does not dangle down. While the size of a stud can vary quite a bit, earrings that extend beyond the perimeters of the earlobes are not generally included in this definition. One of the identifying features of this type of earrings is the way in which they are fitted onto the ear: in almost all cases, they are affixed with a post rather than a hook. The material used and the shape of these materials can vary quite a bit.