Double pearl found in Christmas Eve oyster

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

YERSEKE – Eating a meal of oysters was a special treat for Hannah in Yerseke on Christmas Eve. Because Hannah found a gem in one of the oysters.

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.

This Yerseke pearl was not just any pearl, but a double pearl; two pearls joined in a conjoined twins-like way.

Biologists say the chance of finding a pearl inside an oyster is one in 10,000.

Pearl discovery in American jackknife clam: here.