The main often used for infustrial production imitation pearls have plastic bead,glass bead,shell bead etc.
1.Plstic imitation pearls made of plastic material and coated with pearl pigment,looks very beautiful and light to the touch.
2.glass imitation pearls appeared in seventeenth century and glass has been used to imitate pearl.
3.Joquin from a rose factory in france, he had found a flashy substance from the water has been wash fish and use them to concentrated make into pearl pigment.
   joquin began making imitation pearls in 1656, he put hollow glass beads immersion acid gas to delustring
   then spread the pearl pigment of his invention in it then put candles or rubber in it again to increase of weight of beads, this kind of imitation often appear in antiquated jewelry.
4.shell imitate pearl beads is made from polishing shell to be bead then coated with pearl pigment to finish.