ne of the rarer pearls and the more expensive are natural pearls, produced 'by accident' when underwater irritants enter the shell of an oyster. Cultured pearls are the more common, since they are created using artificially planted 'nuclei'. They are in no way inferior to natural pearls and in fact are quite valuable; they are just produced differently. When choosing fine white pearls, remember several factors that contribute to its beauty and value: the nacre thickness, luster, surface texture, size and shape.
Nacre thickness is probably the most important factor to consider when buying white pearls. Nacre is the crystalline/organic substance that is excreted by the oyster or mollusk when an irritant or nucleus enters its shell. This substance coats the irritant in layers, until it becomes thick. This coated irritant or nuclei becomes the pearl.
Nacre thickness differentiates a high-quality pearl from a low-grade one. The thicker the nacre coating, the more durable and long-lasting the pearl is. Pearls with thinner nacres usually do not maintain their luster over the years and may in fact chip off.
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