Yes! You can find pearls in Hama Hama oysters. The shuckers normally find several a day. Pacific oyster pearls aren't valuable, but they are really cool. (Jewelry pearls are produced by pearl oysters, which are in a different genus than edible oysters. Read this for more information about cultured and wild pearls.)
These pearls (there were originally 600 of them) all came from ONE medium sized (and extremely irritable) oyster.