Stories tagged Carnegie Institute


10 Carat Diamond: Credit: Carnegie Institution This 5-carat diamond was laser-cut from a 10-carat single crystal produced by high-growth rate CVD.

If a small diamond is placed in an environment with just the right pressure, temperature, and an atmosphere rich in vaporized carbon, the carbon vapor will start attaching to the surfaces of the "seed" diamond. Layer by layer the diamond will get bigger. Scientists think that growing 300 carat diamonds (one inch) will soon be possible.

Researchers at the Carnegie Institution of Washington, D.C. have produced 10-carat, half-inch thick single-crystal diamonds at rapid growth rates (100 micrometers per hour) using a chemical vapor deposition (CVD) process. The size is approximately five times that of commercially available diamonds produced by the standard high-pressure/high-temperature (HPHT) method and other CVD techniques.