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Thread: What is a Pearl?

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    Senior Member Array mrina's Avatar
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    What is a Pearl?

    What is a Pearl?
    A pearl is a hard, roundish object produced within the soft tissue (specifically the mantle) of a living shelled mollusk. Just like the shell of mollusks, a pearl is composed 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.



     



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    Senior Member Array mrina's Avatar
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    Physical properties
    The unique luster of pearls depends upon the reflection, refraction, and diffraction of light from the translucent layers. The thinner and more numerous the layers in the pearl, the finer the luster. The iridescence that pearls display is caused by the overlapping of successive layers, which breaks up light falling on the surface.
    In addition, pearls (especially cultured freshwater pearls) can be dyed yellow, green, blue, brown, pink, purple, or black.
    Pearl Farm on Seram, Indonesia I took this, and license it under the gfdl and cc share-a-like.
    Freshwater and saltwater pearls
    Freshwater and saltwater pearls may sometimes look quite similar, but they come from very different sources.
    Natural freshwater pearls form in various species of freshwater mussels, family Unionidae, which live in lakes, rivers, ponds and other bodies of fresh water. These freshwater pearl mussels occur not only in hotter climates, but also in colder more temperate areas such as Scotland: see the freshwater pearl mussel. However, most freshwater cultured pearls sold today come from China.
    Saltwater pearls grow within pearl oysters, family Pteriidae, which live in oceans. Saltwater pearl oysters are usually cultivated in protected lagoons or volcanic atolls.

    Margaritifera margaritifera, double valved specimen, length 108 mm.,inner side; Teisnach, Germany, 1964













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    beautifullll.......

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    Pearl Necklace

    It is a fashionable site. It's a good forum. Pearl is fashion accessories for woman. Thanks








    Pearl Jewellery

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