Do river clams have pearls?

Best answer:

There are pearls, but not every river clam has pearls. Generally, it is not easy for wild pearls to grow. It takes a long time to secrete nacre and wrap up small insects or small grains of sand to form pearls. There are some pearl clams on the market that are specially used for cultivating pearls, such as spinnaker clams, pleated crown clams, etc.