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Pearls are made by some sort of irritant landing inside. It is then coated by mother-of-pearl. As time passes, this irritant cannot be expelled so mother-of-pearl is continually coating it. It takes a long time for the irritant to become covered by enough mother-of-pearl to be considered a pearl and the older the mollusk, the more time it will have had to coat it.

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12y ago
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Anonymous

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3y ago

Because the shells spends more time growing a larger pearl.

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Q: Why are good sized pearls are found more often in older and larger shells?
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