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Mother of Pearl is the creation of a living organism and environmental factors play a crucial role in its formation. Mother of Pearl producing mollusks cannot regulate their body temperature, and so are susceptible to changes in external conditions.

If the waters reach a high temperature of 30 degrees Celsius, as in the Pacific, the mollusks metabolism is increased and they grow faster secreting more nacre than a mollusk who lives in colder waters. However the layers of nacre are thick and not as translucent and the crystal structure is not perfect resulting in a duller, less lustrous Mother of Pearl. Therefore Mother of Pearl is rarely harvested in the hotter summer months.

However, when temperatures go down to 16 degrees Celsius the mollusks metabolism is low, and produces nacre at a slower rate. These nacre layers are thinner and the crystal structure more even resulting in an increased translucency and better luster.

Mother of Pearl or Nacre appears in a variety of color from white to black and nearly every other color in between. It derives its color from three sources: genetic make-up, food and trace metals in the water and lastly to a lesser extent depth and salt content of the water.

The mollusk’s genes are in part responsible for the color of the Mother of Pearl. A rainbow-lipped, or black-lipped oyster instinctively creates darker colors, whereas a white-lipped oyster makes lighter colors.
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