u/Be-Queen-Bee

My dad found these pearls in an old building he was tearing down for a neighbor. There were actually a few nice pieces in the can this was found in. I know they are in terrible condition. So I need to know how to clean them and if you think they are real? Or know anything about them? Thanks in advance. The clasp seems to be broken but the other piece is actually inside the clasp. The clasp is what makes me think they may be real.