One of the things noted this weekend was this article on experiments that took place on culturing bead cultured blister "pearls" a few years ago. Not commercial, but just attempts it seems: https://www.gia.edu/gia-news-research/pinctada-maculata-bead-cultured-blister-pearls-shells
Will post the other link on the natural pearl thread as more applicable.
Will post the other link on the natural pearl thread as more applicable.