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Black Onyx is a beautiful opaque gemstone that is a very deep black colour. The Onyx gemstone itself is a cryptocrystalline form of quartz, and comes in many colours ranging from white to almost every color accept purple. Black is a very popular colour in jewellery as it is versatile and can go with many differnet colours.
Read about Black Onyx in our gemstone guide >
More about Black Onyx from Wikipedia >