Cleanliness refers to the absence of disfiguring spots, bumps or cracks on the surface of a pearl.
The cleaner the surface of the pearl, the more valuable. Since cultured pearls are grown by oysters in nature, it is very rare to find a perfectly round pearl. However, the rounder the pearl, the more valuable it is. Baroque pearls, which are asymmetrical in shape, can be lustrous and appealing, and often cost less than round pearls. Cultured pearls come in a variety of colors from rose to black.