"Diamond rain" on the giant icy planets Neptune and Uranus could be more common than previously thought, say scientists.

"What we were interested in is, when is carbon not diamond?" Finding the answer involves something called a diamond anvil cell.

With the right amount of pressure and surprisingly little heat, a substance found in fossil fuels can transform into pure diamonds.

Machine learning predicts 43 previously unknown, superhard forms of carbon. Could one offer a cheaper alternative to diamond?

With a new method, scientists doped nanodiamonds with silicon, which made them glow a deep red.