Shells are found in a small water pool, and colorful pearls are collected after opening mussels

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The mussels have grown up and can be opened to get pearls. Golden pearls are too rare

Freshwater pearl mussel - Wikipedia

Impact of Culture Period on Quality of Image Pearls Produced by the Freshwater Mussel, Lamellidens marginalis, in Bangladesh

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Cold Water Shelling – Beachcombing Magazine

How to collect colorful pearls satisfactorily, mining freshwater mussels is too stressful

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Cold Water Shelling – Beachcombing Magazine