EOAS Post-doc fellow Nester Korolev and others have discovered a deep mineral, the fourth most abundant in the Earth, inside a diamond. The mineral can only exist deeper than at ~ 600 km and has never been seen on the surface before.

Check out the paper here: https://www.nature.com/articles/nature25972

For more information, see this Science Alert article: https://www.sciencealert.com/super-deep-diamond-contains-calcium-silica…