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Black as a Diamond

    It's out of this world. Really, this black diamond is clearly from outer space.  Appropriately nicknamed "The Enigma," this hunky black rock heads to Sotheby's London for auction soon. The rare naturally faceted inky hued stone has its origins in outer space, explains Sotheby's experts. Before they were glamorized in modern jewelry, black diamonds were known as carbonado. There have been some placed in striking jewelry--occasionally in large sizes too. And the stones have garnered abundant loyal fans owing to their dramatic appearance and exotic look. Extra-Terrestrial Roots Its creation is likely to have been the result of either a meteoric impact or "from a diamond-bearing asteroid that collided with Earth," Sotheby's reports. They can be dated to up to 3.8 billion years. Yup. This is old. The telltale give-a-way in the black diamond is the presence of nitrogen and hydrogen--which points to interstellar space. But it also contains the mineral o

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