Why Do Oysters Make Pearls?

Do oysters make pearls to make them more desirable to humans or is this process little more than a happy accident.

Why do clams make pearls?

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Pearl farm in halong bay vietnam showing process #pearls

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Why Do Oysters Make Pearls Here's What You Need To Know

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How an oyster builds a perfectly round pearl

How do oysters make pearls?, ArabiaWeather

The True Story Behind How Pearls Are Made

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What Is an Oyster? How Do Oysters Make Pearls? - TPS Blog