By Aamir Mannan.
The nucleus bead in a beaded cultured pearl is generally a polished sphere made from freshwater mulyst for the pearl sac, it is surgically implanted into the gonad (reproductive organ) of a saltwater ssel shell. Along with a small piece of mantle tissue from another mollusk (donor shell) to serve as a catamollusk. In freshwater perliculture, only the piece of tissue is used in most cases, and is inserted into the fleshy mantle of the host mussel. South Sea and Tahitian pearl oysters, also known as Pinctada maxima and Pinctada margaritifera, which survive the subsequent surgery to remove the finished pearl, are often implanted with a new, larger beads as part of the same procedure and then returned to the water for another 2–3 years of growth.
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