Nacre

Nacre, also known as mother-of-pearl, is an organic–inorganic composite material produced by some molluscs as an inner shell layer. It is also the material of which pearls are composed. It is strong, resilient, and iridescent.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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Pearls, understood — types and grading, sizing and care, and the calculators that take the guesswork out of buying and stringing them.

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