How do oysters produce pearls?

While most jewelry is made from precious metals and gems found underground, pearls are the result of a biological process in the sea, which happens by chance!

When a grain of sand or some foreign body enters an oyster and is unable to expel the "invader", it produces a smooth, hard crystalline substance (made up of calcium carbonate) around it to protect itself. As long as the invader remains there, the oyster continues to produce layers of this substance, until after some years it is trapped inside a smooth and shiny shell, which has now become a unique pearl.

In recent years, with the pollution of the seas and the ecological system, one sector that has been affected has been that of natural pearls. As demand increased and quantities were not sufficient, their cultivation began in special pearl farms. This process, of course, is time-consuming and not at all easy. Suffice it to say that out of the 2,000 mussels that will be cultivated, only 10 of them will produce  pearls that will be of high quality standards. 

The color of the pearl varies and can be white, silver, cream, gold, green, blue or black, depending on the oyster or shellfish in which it is found, in combination with the water conditions and the core used in each culture.