Researchers find new phase of carbon, make diamond at room temperature

"We've now created a third solid phase of carbon," says Jay Narayan, the John C. Fan Distinguished Chair Professor of Materials Science and Engineering at NC State and lead author of three papers describing the work. "The only place it may be found in the natural world would be possibly in the core of some planets."
http://m.phys.org/news/2015-11-phase-carbon-diamond-room-temperature.html