October is a month which is adorned with two birthstones, Opal and Tourmaline. The more well recognized of the two is Opal. Opal is a radiant gemstone formed by non-crystalline silica gel. The particles are packed together in specific arrangements giving it its characteristic luminosity. Opal is often the most common purchase for an October birthstone, but its sister birthstone is equally beautiful  and even has...

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