I recently bought a nice peridot ring at a flea market but it was slightly large. I could have it re-sized but that would cost more than the ring did. The inside of this ring is like that of a man's class ring. I'm not sure this would work on a smaller band. I had some self-adhesive Velcro around so I cut a small oval from the fuzzy tape and stuck it to the inside of the dome shape. Now the ring fits just right and the fuzzy tape feels good against my skin. I won't get this wet so it should hold up for a while. It can't be seen from the outside.