Pearl is an ancient gemstone that people often use in fairy tales to represent beautiful and precious people or things. There are many kinds of pearls, various shapes, bright colors, and warm colors that many people like very much. Today, let me introduce the formation of pearls!
When the mussels are feeding on the seabed, the shells are opened, and foreign objects such as sand and parasites occasionally fall in, and the mantle is stimulated. It is round and gradually forms a pearl capsule – a shiny and moist outer layer. Based on this principle, cultured pearls are formed by inserting round beads into mussels using the nucleation technique.
It is generally believed that the epidermal cells of the mantle of mussels are rapidly divided and proliferated by a certain stimulus, and gradually surround the stimulus source to form a complete pearl sac, and center on the stimulus source, gradually secrete nacre layer by layer, thereby forming pearls . Thus, the resulting pearl is spherical or non-spherical, depending on whether the nacre accumulates uniformly around the stimulus.
A foreign body such as sand, worms or worm eggs accidentally entered the interior of the mussel shell, and was trapped in the connective tissue of the mussel together with some of the mantle epidermal cells. Nucleated pearls are formed.
A part of the epidermal cell tissue of the mantle is separated from its original location due to disease or injury, enters the connective tissue, divides and proliferates to form a pearl sac, and finally forms a non-nucleated pearl.
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