http://www.newsweek.com/diamond-found-earth-1026382

Sound waves may have detected huge numbers of diamonds lying beneath the Earth’s surface.

An international team of scientists says that diamonds might be scattered in the Earth’s crust and mantle, according to a June 19 study released in the journal Geochemistry, Geophysics, Geosystems, MIT announced Monday. The scientists set out to research a seismic anomaly and found something surprising—and shiny.