I have held in my hand a pearl from a nautilus last week end.
The pearl was egg shaped, about 8x6mm, white, it seemed translucent, porcelain-like. The surface was not smooth.
I did some research, and the only reference to a nautilus pearl I could find is an article in a French magazine La Nature in 1912. This article says that a photography of a nautilus pearl was given by a Mr. Lyster Jameson to Nature Magazine (14x11mm, 18 carat). I don't know if the photo has been published in that magazine.
Has anyone else heard of nautilus pearls ?