Pearls are made by marine oysters and freshwater mussels as a natural defence ... Other bivalve molluscs and gastropods can produce pearls, but these aren't made of nacre.

Only oysters of the Ostreidae family can make pearls, but many other types of mollusks can produce these gems, such as abalone and paua (New Zealand abalone), conchs, freshwater mussels ...

Neolithic people – roaming the land 3500 to 3000 BC – consumed vast quantities of shellfish, including oysters. How do we know ... open an oyster to seize its pearl. But the expression ...

He explained that the artificial breeding of these oysters is a complex process that takes at least three years before they can produce pearls. "From the moment the oysters are just 2 mm in shell ...

He explained that the artificial breeding of these oysters is a complex process that takes at least three years before they can produce pearls. "From the moment the oysters are just two ...

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