The brilliantly shiny diamond is more than just pretty; it's one of the hardest minerals on Earth, with a name derived from the Greek word adámas, meaning unbreakable. Scientists have now engineered a ...

Diamonds are famous for their strength, but scientists have long suspected that another form of diamond might be even harder.

Researchers have produced nearly pure hexagonal diamond, a material long theorized to be harder than conventional diamond, by compressing and heating graphite under extreme conditions. The resulting ...

After decades of chasing after a rare hexagonal diamond, a Chinese team says their iteration of the elusive material is the most important yet. Reading time 3 minutes In 1962, researchers hypothesized ...

After decades of debate, researchers say that they have found the clearest evidence yet for this rare form of carbon ...