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non-nacreous pearl
A natural pearl that does not have a nacreous surface layer, like pearls produced by clams, conches and scallops
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A characteristic of the irridescence or luster of natural and cultured pearls ...
To this date, none of the non-nacreous pearls have been successfully cultured, and each has a unique structure which makes its difficult to fake, so that there is little worry about synthetics and simulants.
Value ...
 See also: Jewel, Glass, Natural, Surface, Size
  
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