A pearl is formed when a something gets inside the oyster that is not supposed to be there. It's kind of like a rock in your shoe. The oyster then covers it in the same stuff it makes its shell with. A pearl is born.
In other words, the oyster takes something uncomfortable and completely engulfs it using the unique talent it was designed with to make something rare and precious. Something that only it can make.
The rock in your shoe is trying to get your attention. Engulf it with your unique talent and make something precious.