A few species produce pearls that can be of interest as gemstones.

Not all mussels and oysters produce pearls.

In a haul of three tons, only three or four oysters will produce perfect pearls.

Many different kinds of molluscs can produce pearls.

Margaret, whose name means "pearl," begins in the integument of her flesh to produce pearls.

Most Tahitian pearl farm harvests, for example, produce more than 40 percent baroque and semi-baroque pearls.

All species within the genus produce pearls of commercial value.

The breeding of pearl oysters in the lagoon can produce black pearls.

Not all individual oysters produce pearls naturally.

Species in this genus sometimes produce large pearls.