Here are four short ways to say it:
- A tiny grain gets inside an oyster and the oyster covers it with shiny layers to make a pearl.
- An oyster finds a little bit of sand and wraps it in glossy coats until it becomes a pearl.
- A small speck slips into the shell, and the oyster keeps adding smooth layers to turn it into a pearl.
- A grain gets stuck inside an oyster, and the oyster builds up shiny layers around it to grow a pearl.