All pearls are formed when a small object finds its way into a oyster and becomes an irritant. As a natural reaction the oyster coats it with a substance called nacre and it is the continual covering of this nacre which we call the pearl.

There are two types of pearls. Natural and cultivated. Natural pearls are those which nature has formed by itself. The irritant has gotten into the oyster through some crevasse or small opening and irritated the oyster to form the nacre covering.

A cultivated pearl is made by the deliberate insertion of a foreign substance, often another piece of shell, to the oyster and then nurturing it for a number of years until a pearl is made.

Whereas the natural pearl can be many different shapes and sizes and even colors, the cultivated pearl tends to be round or spherical in shape although coloring can be added to ensure the pearl is of a particular hue or color.