Let's take a look at the full range of possibilities for millepedes:
http://www.bezoarmustikapearls.com/millipede.html. I don't think they polish up nearly as well as the Nagasaris
.
No doubt there is a high degree of fantasy here, but also with a liklihood that some wheat exists among the chaff. Surely this forum is well familiar by now with my preference to go 'off the beaten path' but beauty remains first and foremost in mind (no interest in the coconut pearls, for example).
I do agree that the Nagasari tree pearl wood grain, whatever the scientific origin, may well complement nacreous pearl jewelry—in particular the naturals, with their more organic appeal.
Steve
Seattle