Diamonds are the most sought-after and admired gemstones, with a sparkling brilliance that sets them apart from all other jewelry. That’s as true today, when diamonds are mined on an industrial ...

New findings explain how the world's biggest and most-valuable diamonds formed -- from metallic liquid deep inside Earth's mantle. The research team studied large gem diamonds like the world ...

Diamonds Unearthed In the first installment of a multi-part series, Smithsonian diamond expert Jeffrey Post explains how the rare crystals form ...

Chemical analyses of the rarest diamonds suggest the planet’s carbon cycle may not go as deep as scientists thought.

Eclogitic diamonds formed in Earth's mantle originate from oceanic crust, rather than marine sediments as commonly thought, according to a new study from University of Alberta geologists.

The cause of diamond precipitation has previously been attributed to poorly understood redox changes at depth. Here, the authors propose that a drop in pH during water–rock interactions leads to ...