Hi, I'm going to send Caitlin a few photos of some Atrina vexillium, or vexillum, depending upon the reference. About 20 carats, worked according to GIA, but I'm not finding much about this particular type of pearl in any book. So I would appreciate information. One of them has an area of intense "peacock irridescence" which must be nacreous, while the majority of the surface appears only porcelaneous. Photo to follow.
Pearl-guide identifies Atrina v. as coming from the Americas, but I am certain these came from near Borneo.
Tom Stern,MD