Oldest Diamond Found on Earth

The tiny diamonds were found trapped in zircon, a rare and exceptionally stable mineral that forms under temperatures between 1,112 and 1,652 Fahrenheit (600 and 900 degrees Celsius). Once zircon has crystallized it may be moved around by geological processes, but its chemical makeup and structure don't change. This makes its age easy to pinpoint. Zircon crystals represent the only record of the first 400 million to 500 million years of Earth's history, Wilde explained.
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