The 'pearl in the oyster' is being able to run an application in a machine, but not alter the machine in any way.

We'd like to let anybody run any operating system (OS) on any machine. You'll be able to buy any application you want and not worry what OS it runs on.

Oysters speaking doesn't give a pearl.

All art is autobiographical. The pearl is the oyster's autobiography.

Oysters speaking doesn't give a pearl. (Les huîtres qui parlent - N'ont pas de perle)

If that happens, that oyster will not come back ever unless you dump oyster shells,