Deep below the surface of our world, far beyond our feeble reach, enigmatic processes grind and roil. Every now and then, the Earth disgorges clues to their nature: tiny chthonic diamonds encasing ...

A pair of diamonds that formed hundreds of kilometers deep in Earth’s malleable mantle both contain specks of materials that form in completely opposing chemical environments—a combination so unusual ...

Diamonds that formed deep below the Earth's surface are revealing the secrets of an ancient supercontinent that existed hundreds of millions of years ago. A study of these "super-deep" diamonds has ...

This cartoon shows a subducting oceanic plate traveling like a conveyor belt from the surface down to the lower mantle. The white arrows show the comparatively well-established shallow recycling ...

Researchers have penned a new study that reveals the discovery of a rare mineral that forms under extremely high pressure and high temperature in Earth's mantle. The mineral that was found is called ...

Millions of years ago, precious gem stones from the heart of southern Africa washed westward along the Orange River and emptied into the Atlantic Ocean. While some swept up on the beaches along the ...

Small black specks in a diamond from an African mine have turned out to be a vital ingredient of the deep Earth, identified in nature for the first time after decades of searching. It is a rare ...

A rough diamond unearthed in Botswana in the final quarter of 2025 has drawn sustained attention from geoscientists and ...