Found while eating oysters San Francisco Wharf

My husband ordered a dozen raw oysters while eating at Sabella's and De Torres on the wharf, in San Francisco California...of course I had to try a few. Chewing slowly to savor the moment, then I felt the hard substance, worked it to the front of my tongue, and behold...THE PEARL! (Thank goodness it was not a filling)
Although, it probably is not worth much, it was very exciting, and the folks at the restaurant were also excited, because it was one of the first to be found in there in a long time. It is now a keep sake and I had it mounted in a cage pendant.