Pearls are made by marine oysters and freshwater mussels as a natural defence against an irritant such as a parasite entering their shell or damage to their fragile body. The oyster or mussel slowly ...

The genus ot shell-fish, Pentadinrz, furnishas the finest pearls as well as mo-ther-ot-pearl: it is found round the coasts of Ceylon, near Ormus, in the Persian Gulf, at Cape Comorin, and in some ...

What is it? Well, many of the manicures feature this ethereal, pearly, opalescent finish, a bit like the mother-of-pearl-insides of a mollusc shell. So there, I’m calling it: shell nails are ...

Natural pearls form when some kind of irritant, usually a small organism, makes its way into the shell of a mollusk like an oyster or a mussel. To protect itself from the invader, the mollusk ...

Naturally occurring pearls, whereby an irritant such as a grain of sand gets between the mollusk and its shell and is slowly ...