I read a thread similar to this where peeps beach hunting found rings and the were people trying to claim the ring, who didn't loose it by the way, the story was quiet informative on how to deal with these so called claimers, if the ring has an inscription ask them to tell you what it says, they SHOULD be able to recite it exactly, if it doesn't have an inscription then still ask them to recite the inscription. If there was none, tell them so, and prove that they are full of it. If they answer correctly they may still give you a finders fee or at least a big thank you! I would happily return a ring to its rightful owner, but they had better have there ducks in a line.