Butterfly Back

A butterfly back is a type of earring fastener that consists of two separate parts. The first part is the post, a straight rod connected to the decorative part of the earring, which is passed through the earlobe. The second part is the butterfly back itself, a small counterpart that slides onto the post from behind. Thanks to friction, it holds the earring in place and prevents it from slipping out. Due to its shape, this fastener is sometimes called a “butterfly” and is most commonly used with stud earrings.