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From PBS NOVA:
“Glittering stars in the night sky aside, scientists have long known that some diamonds hail from the heavens. In 1981, for example, when Smithsonian researchers tried to cut through a large iron meteorite that had crash-landed in the Allen Hills of Antarctica, the sawteeth on their blade got all chewed up. Subsequent X-rays showed that the stone was riddled with microscopic diamonds, the hardest substance known. The scientists theorized that the meteorite’s diamonds were born during a cataclysmic collision out in the asteroid belt.”
http://www.pbs.org/wgbh/nova/space/diamonds-in-the-sky.html
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