I left a few months for work in Tahiti, I visited pearl farm and also a center of the pearl, which explained to us that. There is less and less natural pearl and for others created by man with the little piece of plastic, if it is not perfect and not a degree of mother-of-pearl greater than a certain number of millimeters, it is sold in bulk or put on jewels by hiding the less beautiful side. meric for your sharing, upvote with pleasure ^^