Well, here are the latest results. I very carefully drilled the pearl, going from the end that looked to be the bead end. I drilled carefully, but the pressure of the cups holding the pearl caused the surface to completely crack. One small piece fell out (OK with a little prodding from me) and here are pictures. The end without the bead was completely hollow, and a little stinking, but no liquid. More and more I am wondering if this is some kind of Akoya baroque, albeit a large one. Are they trying to grow larger Akoya's anywhere? Here are the pics. Your opinions welcome, although the mystery is somewhat moot now.