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Black MOP (Mother of Pearls)
Hardness: 6.0 to 6.75
The natural Black Mops are also well recognized as "Black Mother of Pearls". The black color of these natural stones varies from place to place according to the amount of impurities present in them. These stones are cut and designed according to the industrial requirements of the beads made out these stones. Due to the presence of other minerals, several bands of other colors can be observed on the surface of them.
