Difference between Mother-of-pearl and Nacre

What is the difference between Mother-of-pearl and Nacre?

Mother-of-pearl as a noun is the hard pearly inner layer of certain mollusk shells; nacre. while Nacre as a noun is a pearly substance which lines the interior of many shells, and is most perfect in the mother-of-pearl.

We hope you now know whether to use Mother-of-pearl or Nacre in your sentence.