This video says about itself:
Video on how pearls are formed naturally
Built from hexagonal aragonite crystals of calcium carbonate, pearls are formed in clams, oysters and mussels, and are found in many parts of the world. They are usually white, sometimes with a creamy or pinkish tinge, but may be tinted with yellow, green, blue, brown, or black. Black pearls are often highly valued because of their rarity.
Translated from Dutch regional TV Omroep Zeeland today:
Woman finds pearl in oyster
Hannah van den Boomgaard: “When I ate the oysters I felt something hard in my mouth. I thought it was a small crab, until I put it in my hand, and then it proved to be a real pearl.”
Ms van den Boomgaard had received the oysters from her neighbour who works in the oyster industry. … She wants to put the pearl into a ring. How much the pearl is worth is still unclear.
Biologists say the chance of finding a pearl inside an oyster is one in 10,000.
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