Mother-of-pearl ... thickness to render the shell an object of manufacture. The genus ot shell-fish, Pentadinrz, furnishas the finest pearls as well as mo-ther-ot-pearl: it is found round the ...

according to analysts at pearl-lang.com. Even if the mother and daughter had ordered two dozen, a hefty profit would be in the cards. That's one 'shell' of a discovery, some might say - as pearls ...