Diamond Foundry Grows First 200mm Single-Crystal Diamond
SAN FRANCISCO – November 06, 2026 -- Diamond Foundry Inc. has produced the first single-crystal diamond measuring 200 millimeters in diameter, a size the company says brings the material to semiconductor wafer scale.
The company unveiled the D200mm crystal alongside a video keynote by CEO Martin Roscheisen at CarbonSemi 2026 in Ningbo, China. Diamond Foundry states the crystal is neither an assembly of smaller diamond pieces nor a polycrystalline wafer. The first crystal is shown as grown and unpolished.
Crystal size has been the main constraint on diamond in electronics
Diamond Foundry says diamond combines the highest thermal conductivity with mechanical strength, electrical insulation and optical properties. Its use in advanced technology has been limited by crystal size. Natural diamond is constrained by geology, and conventional lab-grown diamond has historically been limited to relatively small crystals, according to the company.