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

The clarity and color of most diamonds made from the HPHT method are usually ... slicing diamond seed in a sealed chamber filled with carbon-rich gas, usually methane, mixed with hydrogen.

Diamonds form as single crystals of carbon. Geologists think this happens when a change in pressure or temperature, or some other chemical reaction, cools liquefied mantle rock containing carbon ...

In 2018, the FTC permitted “a mineral consisting essentially of pure carbon crystallized in the isometric system” to be described as a “diamond,” whether naturally occurring or man-made.

While called many things - lab-grown diamonds, man-made diamonds, and lab-created diamonds, among others - upon seeing ...

Though made in a lab, synthetic diamonds "consist of actual carbon atoms arranged in the characteristic diamond crystal structure," Brilliant Earth said, so they look nearly identical to real ...

Diamonds form deep within the Earth's mantle, around 250 kilometers below the surface, where immense pressure (up to 10 GPa) and temperatures (around 2,200 °C) compress carbon into diamonds over ...