Two of the world’s most famous diamonds may have originated super deep below Earth’s surface, near the planet’s core.

All of Earth‘s natural diamonds first form deep underground from our perspective on the surface. But from the perspective of this planet’s great bulk, their usual births occur relatively far from the core. Zest the Earth like a lemon, and you’d uncover diamonds growing at the bottoms of tectonic plates. Those diamonds form about 90 to 125 miles (150 to 200 kilometers) deep, under pressure that exists just where the crust meets the more fluid outer mantle, or middle layer of the planet. No mines reach that far underground, but some of those diamonds do make their way up to where humans can reach them.

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