Pearls vary in quality, production methods and prices. Generally, the price of artificial farming is much lower than that of natural farming. Good gloss is much more expensive than poor gloss. The beauty of a pearl depends largely on its luster. Pearls with dull or less light lack aura, so the stronger the luster of the pearl surface, the more valuable it is.

Pearl, also known as mussel pearl and lotus pearl, is an ancient organic gem, which is mainly produced in mollusks such as Pinctada and Pinctada. Pearl is a mineral bead containing calcium carbonate produced by the endocrine function of shellfish, which is composed of a large number of tiny aragonite crystals. Rich in variety, different in shape and colorful. According to the research of geology and archaeology, there were pearls on the earth 200 million years ago.

Shape classification of pearls

1, round beads: refers to round pearls, which are divided into three types according to roundness, namely regular round beads, round beads and nearly round beads. A perfect round ball is the one with the best roundness, which is also commonly known as walking ball in business. The ratio of the difference between the maximum diameter and the minimum diameter to the average diameter is less than 1%. A round pearl refers to a pearl with a very round shape, and the percentage of its diameter difference is between 1%-5%; Near-round pearls refer to pearls that are close to round pearls in morphology, and the percentage of diameter difference is between 5%- 10%.

2. Elliptical bead: refers to a pearl with an oval shape and an aspect ratio 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 bead: refers to an approximate plane shape with a flat surface and one or two sides, such as oblate circle, oblate ellipse, pie shape, diamond shape and square shape. This kind of pearl is most suitable for connecting pearls with beads.

4. Ma Beizhu: It is a kind of semi-bead, also known as Ma Beizhu, steamed bread bead and semi-round bead, also known as Ma Beizhu.

5. Alien pearls: Besides round pearls, oval pearls and Mabi pearls, there are many other 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 special-shaped pearls.