Atomic structure of the hexagonal diamond. Image from the study. Researchers named it lonsdaleite, after crystallographer ...

Diamond is the only gem with a single element. Diamonds are formed in the Earth’s mantle, at depths exceeding 120 km (75 miles), under extreme temperatures and pressures. Over a billion years, the ...

Even with the weight of worlds on its shoulders, diamond resolutely refuses to buckle under the pressure. Thanks to the highest-pressure X-ray diffraction experiments ever reported, researchers have ...