when discussing the cause of pearl-formation, have contented themselves with recapitulating what has already been written on the subject, without attempting to verify or refute the various ...

Pearls form when a foreign substance, such as a grain of sand or a parasitic organism, enters the oyster and irritates its mantle. In response, the mantle secretes layers of nacre, the same ...

But let's rewind for a second. What is a natural pearl, and how are they formed? Natural pearls form when some kind of irritant, usually a small organism, makes its way into the shell of a mollusk ...

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 ...

Here, the traditional rows of pearls form a perfectly imperfect rainbow of hues, all the warmer when juxtaposed against dark diamond rings. Pearl earrings, when worn in new ways, leave their ...