Abstract
This is a review of color of pearls. It is evident on the base of studies that the color of pearls is the sum of iridescence and body color. The iridescence occurs by the interference of light reflected from the superficial and internal laminar structure of nacre, which is made of the accumulation of crystal layer and thinner organic sheet parallel to the surface of pearls. The crystal layer is from 0.3 to 0.8 μm thick and consists of a definite aggregate of many small tabular crystals of aragonite in a row. On the other hand, the body color is due to the absorption of light by pigment, nacreous matter and other matters.
