News: Suppliers
11 November 2026
Diamond Foundry unveils first 200mm single-crystal diamond
Diamond Foundry Inc of San Francisco, CA, USA has unveiled the first 200mm-diameter single-crystal diamond. The announcement accompanied a keynote presentation by CEO Martin Roscheisen, delivered by video at CarbonSemi 2026 (the 6th Industry Development Summit of Carbon-based Semiconductor & Devices) in Ningbo, China (5–7 November).
Diamond’s use in advanced technology has been constrained by one basic limitation: size. Producing single-crystal diamond at 200mm scale required overcoming fundamental challenges in crystal growth, plasma physics, reactor engineering, materials science, process control and manufacturing. The result is not an assembly of individual diamond pieces and not a polycrystalline diamond wafer, but a single-crystal diamond at 200mm scale.
Picture: First-ever 200mm single-crystal diamond (as-grown, unpolished).
“Hundreds of DF engineers, scientists and technicians contributed to us getting here,” says Roscheisen. “It is the accumulated result of countless experiments, failures, inventions, rebuilt machines, and insights over more than a decade.ˮ
He particularly recognized Stefan Gsell and Martin Fischer, whose work on scaling single-crystal diamond began 25 years ago. “They kept going when the prevailing view was that single-crystal diamond simply could not be made at this scale,” adds Roscheisen. “The perseverance shows as the first-ever D200mm single-crystal diamond. And best of all, it makes D300mm predictable as well.ˮ
From gemstone dimensions to semiconductor dimensions
Conventional lab-grown diamond has historically been constrained to relatively small crystal dimensions. Even as the extraordinary properties of diamond became increasingly relevant to high-power electronics, AI computing, optics, quantum systems, and other advanced technologies, the crystal size remained a fundamental bottleneck. The 200mm single-crystal diamond milestone demonstrates a path beyond that limitation.
For Diamond Foundry, the achievement is part of a broader effort to turn single-crystal diamond from a scarce material measured in gemstones into a tech-industrial semiconductor substrate manufactured at scale.
The implications are particularly significant as computing systems encounter increasingly severe thermal constraints. Modern AI processors concentrate enormous amounts of power into microscopic regions of silicon. Diamondʼs exceptional thermal conductivity can spread that heat at the material level, creating new possibilities for chip architectures, power densities, reliability, and cooling.
New scale for diamond
Diamond Foundry views 200mm not as an end-point, but as the beginning of a new manufacturing era for diamond. The company is developing single-crystal diamond for semiconductor and advanced-technology applications where diamondʼs combination of thermal, mechanical, electrical, and optical properties can enable performance beyond the limits of conventional materials.
Having created the worldʼs first diamond wafer and claiming to be the world’s number-one producer of single-crystal diamond, Diamond Foundry is scaling volume production of substrates with a $2.77bn EU Chips Act project in Spain.
Spain gains European approval for €81m subsidy for Diamond Foundry Europe’s new fab
Diamond Foundry creates first diamond-based electric car inverter
Diamond Foundry creates first 100mm single-crystal diamond wafer
