Diamonds hitch a ride to Earth's surface inside a rare magma called kimberlite, but only if that magma stays buoyant.

Readers share memories of Northeast Ohio, including 1950 Thanksgiving blizzard, playing 1980s video games and hunting rodents ...

Diamonds are made out of carbon — highly organized carbon, that is. Geologists are still guessing how diamonds formed in the ...

A 37-carat diamond, half pink and half colorless, found in Botswana, intrigues scientists due to its two-stage origin and ...