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The short answer is that it depends on the variety of pearl. Traditionally, the Akoya-type pearl has been valued for it's potential for excellent luster, which cannot generally be achieved without good nacre.
But other varieties of pearls, like South Sea White and South Sea Golden pearls, rarely, if ever achieve the same luster as Akoya-type pearls, but they can be very large, which typically makes them more expensive. They do have more problems with roundness and surface blemishes, since the oysters that host them have larger adductor muscles. They can and do they impart larger and more visible characteristics on the surface of the pearl. For these pearls, blemishes affect value more.
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