Thanks for pointing that out Madmox. Yes, there is no doubt that the stone is an opal. The jeweler just stated that it wasn't a fire opal, and suggested that it might be Mexican. That was before I told him a little of the history of the ring. It came to New York by way of Spain. I'm researching the family line, but the oldest individual ownership I can be sure of would probably be around the 1920-30 time frame. Whether it came over with that particular owner, who came from Spain, or it was here earlier I haven't a clue so far. The family does go back to Spanish colonial Florida and Puerto Rico.