Which among the following accurately defines "Mother-of-pearl"?

مندرجہ ذیل میں سے کون سا "مدر آف موتی" کی درست وضاحت کرتا ہے؟

Hard iridescent substance forming the inner layer of certain shells

An oyster which yields the pearl

A special large-sized pearl found in Japan

None of these

Mother-of-pearl is also known as nacre.

It is a hard, shiny, and iridescent substance that forms the inner layer of some mollusk shells.

It is commonly found in pearl oysters, abalones, and freshwater mussels.