O-rings are also the small circular pieces of metal with a diagonal cut used to make or repair jewelry. Any idiot with a pair of needle-nosed pliers and some silver and gold o-rings can repair a number of different jewelry problems, such as earring drops that have come off of the post. O-rings are one of the basic necessities for making one's own jewelry, as well. They're available at places like Beverly's or Hobby Lobby in large and small bags, painted gold or silver or actually made of precious metals.