Even the origins of regular diamonds are still somewhat mysterious, but they're thought to start life as a fluid – most likely ancient seawater trapped deep underground along with sinking oceanic plates. Somehow, perhaps due to a sudden change in temperature or pressure, this mineral-rich water ends up rejecting the carbon that's dissolved within it, which is precipitated out – and under the immense pressures below the Earth's crust, the carbon crystallises into diamonds.
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