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 ...

Researchers have discovered that water, under extreme pressure, can freeze and melt through multiple unexpected pathways, ...

Experiments at high temperatures and pressures reveal chemistry that can generate water on the surface of exoplanets ...

Jeweler Harry Winston donated the famous Hope Diamond—the largest-known deep blue diamond in the world—to the Smithsonian Institution in 1958. It arrived in a plain brown package by registered mail, ...