How did high-pressure research lead to the commercial production of synthetic diamonds?

The commercial production of synthetic diamonds was made possible by advancements in high-pressure physics, specifically the pioneering work of Percy Williams Bridgman. Bridgman developed apparatuses capable of sustaining the extreme pressures required to drive the transition of graphite into diamond, a process that also necessitates high temperatures to overcome kinetic barriers.12

Following these foundational studies, industrial laboratories sought to commercialize the process. In December 1954, Tracy Hall, working for General Electric, achieved the first reproducible synthesis using a "belt-type" apparatus—a device he invented that combined features of opposed-anvil and piston-cylinder designs.13

Researchers subsequently standardized the process, discovering that a melted ferrous metal catalyst is essential for diamond growth at pressures of approximately 6 GPa and temperatures around 1,500 °C. Since 1960, this technology has enabled the mass production of industrial-quality synthetic diamond grit and crystals, which are vital for tools such as grinding wheels and mining drills.12