Oysters are not the only type of mollusk that can produce pearls. Clams and mussels can also produce pearls。Most pearls are produced by oysters in the ocean and by mollusks in lake or river.
Now, thanks to the advent of pearl farming ,every oyster may seem to have a pearl but that is actually not always the case. There are some oysters that have been found that do not have pearls .Why did that happened?To answer this question ,first we need to figure out how are these pearls produced.
There are two basic methods of nucleation are used. Saltwater oysters are generally nucleated using a “bead”, prepared from mother-of-pearl. First, the bead is surrounded by a small piece of mantle tissue taken from a donor oyster. The bead and tissue are then implanted into the oyster’s gonad. The bead serves as a mold, or nucleus, around which the pearl develops. The resulting pearl will contain the bead at its center and will tend to develop in the same general shape as the original bead.Generally speaking, an oyster can only produce 1-2 seawater pearls in her lifetime.
Freshwater mussels are generally grafted using a piece of mantle tissue only, without a bead. This small piece of mantle tissue is placed into an incision in the host mussel’s mantle instead of the gonad. Both sides of the valve can accept grafts, and an average freshwater mussel will produce 24 to 32 pearls per culturing cycle.Plus, the entire freshwater pearl cultivation process requires much less advanced surgical skills for full cultivation than seawater pearl cultivation. This helps to make freshwater pearls easier to cultivate and less expensive than saltwater pearls.Click here to browse a selection of trendy freshwater pearl items.
Therefore, grafting for cultured pearls is an important process to the oyster to produce a pearl, if the shell bead is accepted by the oyster it will eventually become a pearl.If not ,there won’t be a pearl . Grafting is a high-skill task and must be done quickly to maximize the chances of success.Thus,the saltwater pearls are more hazardous ,cultivating oysters in the ocean and caring for them it cost more .Click here to browse a selection of precious seawater pearl jewelry items.