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Originally Posted by Caitlin Williams  Herre is what is most likely one of 10 or so tridacnas. They have not been certified, so Tom still has a question mark by them. |
Surprising to me, both Elizabeth Strack and Wes Rankin studied these in Tucson and believe these are Tridacna pearls and, amazingly, one of them may be a Nautilus Pearl. One said no need for GIA testing, since Tridacna origin is obvious to that person. Nevertheless, I am sending to GIA today, because of need for authentication. My understanding is that Nautilus Pearls rank with the rarest.