The color that a cultivated pearls presents can be obtained basically from three forms:

Natural color
It is the resulting color of the combination of nacre crystals with the salts dissolved in the water, originaly from the mussel or the surroundings. Some techniques of culture increase certain concentrations of natural salts to increase the tendency of the natural colors. Cultivated pearls with natural color are extracted from the mussel or oyster without any type of treatment nor manipulation (except perforation) until arriving at the final jewel.

Radiated color
Just some types of cultivated pearls with elevated number of purity in nacre can be put under an artificial treatment denominated Irradiation, which it emulates other natural processes that consist in radiation emissions which modify the crystalline structure of the nacre into darker colors than the original one, with tendency to a policromatic black, passing through grays and violets. +CONTINUE