According to the above principle, cultured pearls are cut off from the mantle of cultured mussels by artificial methods and implanted into the connective tissue of the mantle together with the artificial nucleus prepared by mussel shells. Implanted cell fragments proliferate rapidly around the artificial nucleus under the nutrition provided by connective tissue, forming pearl sacs and secreting nacre, thus producing artificial nucleated pearls.
Artificial seedless pearls are pearls produced by implanting only small pieces of cells into the mantle, forming pearl sacs through cell proliferation, and secreting mother-of-pearl into the sacs.
Extended data shape classification:
1, round bead
Refers to round pearls, which are divided into three types according to roundness, namely round pearls, round pearls and nearly round pearls.
2. Oval beads
Refers to the oval pearl whose length-diameter ratio is greater than 10%. It can be further divided into short ellipse and long ellipse according to the percentage of long and short diameter difference, and the percentage of long and short diameter difference of short ellipse is10% ~ 20%; The percentage of the diameter difference of the long ellipse is greater than 20%.
3. Flat beads
Refers to a plane shape with one or two sides, such as oblate circle, oblate ellipse, pie shape, diamond shape, square, etc. This kind of pearl is most suitable for making pearl beads.
4. Ma Bizhu
It is a kind of semi-bead, also known as Mabeizhu, steamed bread bead and semi-round bead, also known as Mabeizhu.
5. Shaped beads
In addition to round beads, oval beads and marbi beads, there are many pearls with different shapes. Pear-shaped pearls, drop-shaped pearls, rice-shaped pearls, potato-shaped pearls, bean-shaped pearls and other pearls are collectively called shaped pearls in business.
Baidu Encyclopedia-Pearl