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Other gemstones
Although diamonds are considered the most prized of all gemstones, many other precious stones are used for jewellery. Some gems, for example, amethyst, have become less valued as methods of extracting and importing them have progressed. Some man-made gems can serve in place of natural gems, an example is the cubic zirconia, used in place of the diamond.[6]
Source from : http://en.wikipedia.org/wiki
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