@nikita_agarwal | Updated 29 Jan. 2019
@nikita_agarwal | Posted 28 Jan. 2019
Often pearl color is influenced by the color of the mollusk’s lip, the outer part of the shell. For instance, Tahitian pearls get their light to dark charcoal grey colors from the black-lipped saltwater ster, Pinctada margaritifera. Notice the grey to silvery hues present on the edge of the shell. Another way pearls get their color is from microscopic pigments inside the conchiolin layer. Conchiolin is the organic “glue” that holds the crystalline aragonite layers together. Conchiolin cements these platelets together (think of the structure of a pearl as something like a brick wall, and the conchiolin is the cement). When the conchiolin is pigmented with grey, brown, reddish-brown, black or other colors, this pigment shows through the thin crystalline layers to give the appearance of blue, grey, yellow, green, bronze, black pink and orange hues in the surface of the pearl.