I think I may have found one in the mantle of a commun whelk (Buccinum undatum). Although this is certainly highly unusual I wondered if others had independently come across this phenomenon.
A place to askm can be the Institut Royal des Sciences Naturelles de Belgique... or another place where they have specialised journals of molluscs or invertebrates..They have in the Library oldest records where some may be about that....I used to work in Molluscs and peruse articles there...you never know, ask, maybe they can direct you to find such rare thing, obviously.
Simply Google images "Gastropod pearls" you'll get an eyeful to investigate as to scientific accuracy.
I have personnally observed two small nacred cysts embeded in the mantle of one wild abalone Haliotis fulgens at Isla Natividad, west coast of Baja California península (note that I have handled maybe 20 or 30 including H. rufescens in my whole -quite long- life). The animal was 145 mm of shell length, about 12-15 years of age. I believe this is very rare event. Cysts in this case were only 2 having barroque shape and about 1,2 mm "diameter". Strombus gigas is another gastropod where mante pearls can appear once in a while. Fisherfolk in Belize sometimes have nice red-rose-orange pearls for sale.
Looks like these so-called 'pearls' are actually accident of trapped material that then become burried with calcite made by the molluscs' mantle, as in lamellipods.
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