Giant blobs in Earth’s mantle may be driving a ‘diamond factory’

The boundary region between Earth’s molten mineral core and the mantle, the rocky middle layer, may be a diamond factory.

A new lab experiment has found that under extreme temperatures and pressures, a mixture of iron, carbon and water — all potential components found at the core-mantle boundary — can form diamond. If this process occurs in depth as well a landmay explain some of the mantle’s strange quirks, including why it contains more carbon than scientists expect.