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Luster
Luster is the glow of the pearl and its brilliance to the
human eye. The longer the pearl is left in the oyster to grow
its nacre casing the higher the luster.
Surface condition
The fewer the natural markings or spots on the pearl's visible
surface, the more expensive the pearl.
Shape
The more spherical (rounder) and symmetrical the pearl the
more valuable it will be. Baroque pearls (any unusually shaped
and asymmetrical pearl) can be very attractive and are usually
less expensive than round pearls.
Color
Pearls are available in a rainbow of colors, for example,
pinkish (often called rose), silvery white, greenish white,
creamy, golden, gray, cognac
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