Looking for late 70's or early 80's movie,involved a magic amulet that let a man swim with sharks, plot was finding underwater treasure,beautiful girlfriend,either Florida or Louisiana is where it took place,man died at the nod because amulet came off

Mako: The Jaws of Death (http://www.imdb.com/title/tt0074845/reference)

Looks like someone asked for, and got an answer to, the same movie here:
https://www.askmehelpdesk.com/movies/late-70s-early-80s-movie-guy-who-could-swim-sharks-679744.html