In freshwater mussels that insertion alone is sufficient to start nacre production. Most cultured freshwater pearls are composed entirely of nacre, just like their natural freshwater and natural ...

To protect itself from the invader, the mollusk starts to coat the debris with nacre, or mother-of-pearl, the same material that lines the inner layer of its shell. It continues doing this ...

This creates a material called nacre, also known as mother-of-pearl, which encases the irritant and protects the mollusc from it. When pearls are cultured commercially an irritant is manually inserted ...

Pearls form when a foreign substance, such as a grain of sand or a parasitic organism, enters the oyster and irritates its mantle. In response, the mantle secretes layers of nacre, the same ...

By secreting layers of aragonite and conchiolin, the same substances that are in its calcium carbonate shell, the mollusc creates a material called nacre, commonly known as mother-of-pearl. The oyster ...