The Hope diamond formed astonishingly close to Earth’s core

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

All natural diamonds on Earth are first formed underground from our surface perspective. But from the perspective of this planet’s great mass, its usual births occur relatively far from the nucleus. Peel the earth like a lemon, and you would discover diamonds that grow at the bottom of the tectonic plates. Those diamonds form about 90 to 125 miles (150 to 200 kilometers) deep, under pressure that exists right where the crust meets the most fluid outer mantle, or the planet’s middle layer. There are no mines that go that far underground, but some of those diamonds go as far as humans can reach them.