Scientists created hexagonal diamond harder than regular diamond by squeezing and heating graphite under extreme conditions.

Natural diamond, seen here, has a cubic packing structure. But a much rarer form of diamond has hexagonal packing and has now ...

Two new carbon allotropes (H-carbon and S-carbon) are proposed, as possible candidates for the intermediate superhard phases between graphite and diamond obtained in the process of cold compressing ...

The vast majority of polished diamonds are clear and sparkly, but some come in unexpected colors like blue, green and even ...

A team of scientists from two universities in China have synthesized a material harder than diamond in the laboratory. When carbon is subjected to extreme heat and pressure within the Earth, it ...

After diamond and graphite, it’s the third known solid phase, or form, of the element, materials scientists Jagdish Narayan and Anagh Bhaumik report December 2 in the Journal of Applied Physics.

The arrangement of carbon atoms in diamond, left, and graphite, right (Photo credit: taken from "Eight Allotropes of Carbon" Michael Ströck - Created by Michael Ströck.

Diamonds are not the only form of carbon created using high pressure. A team of physicists at Yale University found that graphite, another form of carbon, becomes diamond-like under cold ...

Scientists have discovered a new phase of solid carbon, called Q-carbon, which is distinct from the known phases of graphite and diamond. They have also developed a technique for using Q-carbon to ...