method of testing whether a pearl is natural or cultured.
cells on the shell side of a mollusk’s mantle tissue produce mother-of-pearl and nacre
|epithelial graft tissue||
piece of mantle tissue from a donor mollusk rooted with a mother-of-pearl bead in the gonad or other body part of a host mollusk to produce a cultured pearl
this covers the mantle of the pearl, protecting the surface that may come into contact with foreign substances