Hi can anyone tell me if the vacuum packed Akoya sea water oyster Pearls from Japan that guarantee a pearl in every shell are originally grown in the host oyster or "placed" in the vacuum packed oyster? It seems to good to be true to get a pearl in every oyster, that's perfectly round and sometimes has twins and sometimes triplets. Also can someone tell me how they are so cheap? Are they nucleated with a plastic bead. Has anyone cut one open? I have seen lots of oyster opening parties on Facebook live and am sceptical