The type of pearl is based on which oyster or mussel it came from. It does not depend on whether the pearl is natural or cultured. Hence, a natural pearl can be an Akoya, Freshwater, South Sea or Tahitian pearl, and so can a cultured pearl.
Perhaps the most mysterious gemstone of all time, pearls are gifts from nature, created by the mollusc family. These include oysters and mussels, but only a handful have the ability to produce truly beautiful pearls.