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"The value of the pearls in jewelry is determined by a combination of
the luster, color, size, lack of surface flaw and symmetry that
are appropriate for the type of pearl under consideration. Among those
attributes, luster is the most important differentiator of pearl
quality according to jewelers. All factors being equal, however, the
larger the pearl the more valuable it is.
Large, perfectly round pearls are rare and highly valued."