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''Aquaprase (also known as blue chalcedony) is a brand-new gemstone that opens up a world of possibilities for designers and jewellers alike. Its colour can be a deep lagoon turquoise in the blue-green spectrum. The stone itself is translucent to opaque and offers a vast range of different patterns to make designs interesting. It also has a good hardness of 7 to 7.5 on the Mohs scale and comes from the quartz family (as do stones like amethyst, citrine, and onyx).''