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Opal stones are truly works of art. It's hard to resist such a vibrant stone that displays a wide range of fancy rainbow-coloured patterns. It's hard to believe how it belongs to the silica mineral family, which includes cristobalite and quartz, and still looks so heavenly. Opals are a stone that has been popular since forever. This October birthstone is never out of style. In fact, it sets the trend. <a href="https://www.cabochonsforsale.com/gemstone/opal">Natural opal for sale</a> <a href="https://www.cabochonsforsale.com/gemstone/aurora">aurora opal</a> <a href="https://www.cabochonsforsale.com/gemstone/moss-agate">moss agate stone</a>