Pearls begin as aberrations on the inside of an oyster shell.

In other words, they need heaps of submerged oyster shells.

The oyster shells were discarded into the area surrounding the fire used for steaming.

It isn't an oyster shell, if that's what you still have in mind.

Sometimes one would go get an oyster shell and lay it at the other's feet.

Wan daylight, the color of an old oyster shell, opened their eyes.

It was built by laying down a bed of crushed oyster shells.

Full of books and oyster shells," a lady said to my mother.

Huge natural reefs, made entirely of oyster shells, have been found for the first time.

They turned over oyster shells, making clouds of sand in the water and then having to wait until it cleared to search some more.