Nacre (noun)

1. The iridescent internal layer of a mollusk shell, especially that of an oyster, abalone, or pearl mussel, used as a decorative material.
2. Mother of pearl.

Origin:

From french nacre, from middle french nacré, from old french nacre "mother-of-pearl".

Examples:

1. The necklace was adorned with small nacre beads.
2. The nacre on the inside of the shell shimmered in the sunlight.
3. Nacre is a strong and durable material that is often used in jewelry.
4. The nacre of the pearl is a result of the irritant within the oyster.
5. The artist used nacre to decorate the box with intricate patterns.