In pearl industry, only pearls of natural black color and from Pinctada margaritifera, Pinctada mazatlanica or Pteria sterna (rainbow-lipped oyster) can be called black pearls.
Among those oysters, Pincatada margaritifera is used extensively for culturing pearl in French Polynesia. That is the pearl called Tahitian pearl.
Some people use the term "black pearl" to refer to any dark colored pearl, dyed or natural color. In this part of natural back pearl, we will discuss Tahitian pearl as it is a distinguished type of real natural black pearls.
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