Jump rings are a Jewellery Finding used for connecting a lot of jewellery components together. The single most useful finding you can have in your bead kit. The jump ring is primarily used for connecting a clasp to a cord end and can also be used as a tag in which to connect to the clasp on the opposite end of the necklace or bracelet. Jump rings give the clasp a little extra freedom of movement.
Jump rings have been used in an ever increasing trend for chainmaille jewellery. String a few jump rings together and you have an extension chain! Jump rings can sometimes be used as a bail to hang a pendant from your necklace or earrings so that the pendant faces forward when worn.