Blister pearl | Britannica (original) (raw)

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types of pearls

• 
  In cultured pearl
  …China have been almost exclusively blister pearls (hemispherical pearls formed attached to the mussel’s shell), which are filled with resin and capped with a flat piece of nacre (mother-of-pearl) to become a mabe pearl or pearl doublet.
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• 
  In pearl
  …one side and are called blister pearls.
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