National Museum of Natural History

Smooth pearls in the shape of orbs and ovals are usually created by bivalves, like mussels, in pearl farms. As with all gems, the less blemishes they have, the more valuable they are. (Chip Clark, Smithsonian)

The True Story Behind How Pearls Are Made

Learn about how mollusks create these shiny gems and how that biological process could change as Earth’s waters warm

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