The beauty of a fine quality pearls is revealed the moment it is removed from the oyster. Such a pearl requires neither colour nor lustre enhancement.

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As with other gemstones, lower quality pearls are commonly subjected to various processes to improve their appearance. Light processing will improve the lustre of a lower quality pearl. This type of treatment does not negatively affect the pearl's structure but the lustre may fade after a few years.

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Heavy chemical treatment may adversely affect the physical integrity of a pearl and can sometimes impart a coarse and chalky look and feel, diminishing the quality and appearance of the pearl over time. Chemical enhancement is an acceptable practice when properly performed but enhancements must always be discovered by the vendor as they do affect a pearl's value.

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Courtesy of "www.australiansouthseapearls.com" / Images:Fabian Heinemann/Wikipedia