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2. Imitation pearl - Wikipedia

   en.wikipedia.org/wiki/Imitation_pearl

   Imitation pearls are man-made faux pearls. They are not to be confused with cultured pearls, which are real pearls created through human intervention. Materials used to create imitation pearls include glass, plastic, and mollusc shells. As an alternative, some plastic beads are coated with a pearlescent substance to imitate the natural ...

3. List of pearls by size - Wikipedia

   en.wikipedia.org/wiki/List_of_pearls_by_size

   The Pearl of Lao Tzu for a long time thought to be the largest pearl, but claims about its size and much of its history were found to be fabricated by a conman by the name of Victor Barbish. [2] Other pearls like the Centaur Pearl, most likely the largest gem pearl at 856.58 carats (171.316 g), have just recently emerged from private collections.

4. Cultured pearl - Wikipedia

   en.wikipedia.org/wiki/Cultured_pearl

   White pearl necklace. A pearl nucleus or a bead for cultured pearl is a sphere (usually) or other shape (occasionally) formed only by cutting and polishing a nacreous shell used to accommodate the nacre secreted from a graft of mantle tissue, that eventually forms the centre of a beaded cultured pearl. [2]

5. Cultured freshwater pearls - Wikipedia

   en.wikipedia.org/wiki/Cultured_freshwater_pearls

   A bead crochet necklace made from crochet lace, sterling silver, and freshwater pearls. Cultured freshwater pearls are pearls that are farmed and created using freshwater mussels. These pearls are produced in Japan and the United States on a limited scale, but are now almost exclusively produced in China.

6. Majorica pearl - Wikipedia

   en.wikipedia.org/wiki/Majorica_pearl

   Majorica imitation pearls are man-made on solid balls, likely made of glass, that are coated with a proprietary coating that is made in part from fish scales. [1] The coated nuclei are then dried and polished, and then dipped in a chemical (possibly cellulose acetate and cellulose nitrate) to harden the surface and guard against discoloration, chipping, and peeling.

7. Dzi bead - Wikipedia

   en.wikipedia.org/wiki/Dzi_bead

   The bead is considered to provide positive spiritual benefits to the wearer. These beads are generally prized as protective amulets and are sometimes grounded and used in traditional Tibetan medicine. Beads subjected to this process shows small "dig marks" where a portion of the bead would have been scraped or ground away to be used in medicine.