A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living shelled mollusk. Just like the shell of a clam, a pearl is made up of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes of pearls (baroque pearls) occur. The finest quality natural pearls have been highly valued as gemstones and objects of beauty for many centuries, and because of this, the word pearl has become a metaphor for something very rare, fine, admirable, and valuable.
The most valuable pearls occur spontaneously in the wild, but they are extremely rare. These wild pearls are referred to as natural pearls. Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of those that are currently sold. Imitation pearls are also widely sold in inexpensive jewellery but the quality of their iridescence is usually very poor, and often, artificial pearls are easily distinguished from genuine pearls. Pearls have been harvested and cultivated primarily for use in jewellery but in the past they were also stitched onto lavish clothing. Pearls have also been crushed and used in cosmetics, medicines, and in paint formulations.
The resulting pearls are naturally hard to find as only one of thousands of oysters in the sea will be developed into a pearl. These pearls are rarely meets the size, shape or colour.
Over the past few years, the application of luxurious pearls as jewellery is gaining popularity in Malaysia. Price of natural pearls (seabed) are expensive to give a chance to people to find a method that everybody can wear pearls, in a relatively short time, and with a much more affordable price. Therefore, there are several companies that have taken the initiative to raise oysters (for pearl production) cultured pearls from oysters are mentioned as freshwater pearls (fresh water Pearls) for commercial purposes.
source: wiki, sabah craft and pearl, sabah pearls, pearl guide
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