Notify the Association of Former Students. I kid you not, I had a friend in Denver who lost his Aggie Ring at some frozen lake in the high country when he decided to throw a snowball across the lake.
Get this, his Aggie Ring was found like 2 years later by -- an Aggie. They notified the Association and the Association published the list of "found" rings. I told my buddy in Denver who had a unique name (Russian) - hey, they found your ring. He was stoked to get it back because he figured it was gone forever.