https://motherboard.vice.com/en_us/article/bjbny8/there-may-be-a-quadrillion-tons-of-diamond-buried-deep-inside-the-earth

It’s diamonds all the way down. That’s according to new research suggesting more than a quadrillion tons of diamond are nestled within the Earth’s interior—1000 times more than previously thought.

A study published on Monday estimates that one to two percent of “craton roots” contain the glittery stuff, approximately 90 to 150 miles beneath the Earth’s surface. These roots are the deepest sections of “cratons,” which are rock layers extending upwards of 200 miles through the Earth’s crust and mantle.