Abstract: A fastener is provided for extendably holding ends of a piece of jewelry together. The fastener includes two fastener bodies and a cord. Each fastener body is affixable to one end of the piece of jewelry. One fastener body includes a housing and a spring biased cord retraction mechanism. The cord retraction mechanism is positioned within the housing. The housing has an opening through which the cord passes. The cord is tethered between the first fastener body and the cord retraction mechanism so that the cord retraction mechanism draws the cord into the second fastener body, pulling the first and second fastener bodies together.