Which of these can be found in shells of mollusks?

I found one in a mussel I was eating while out to dinner. I saved it for a long time

I never knew that. I thought it was only 0ysters.

I've not been to pearl

ora ora ora ora

HAL 9000 - both spellings are correct. Also, any mollusK, or mollusC, depending where you're from, that produces nacre can produce pearls. Scottish freshwater mussels produced some of the most covetable pearls, until they were exploited to bejesus and back. Now no one can enjoy them.

Player #9153958, I like pearl

i always knew that

Uninitialized, me too I just gessed

If i were a mollusk i would have a diamond because i unique