H. Tracy Hall's Diamond Presses

Summary

Utah-born H. Tracy Hall helped create synthetic diamond, then developed multi-anvil presses that made extreme pressure and heat practical. Those machines spread globally through diamond, ceramics, materials research, and manufacturing, turning a laboratory breakthrough into an industrial frontier.

Impact

Synthetic diamond reshaped cutting, grinding, polishing, drilling, and heat management across manufacturing. The original GE breakthrough did not happen in Utah, so this page does not claim it. The Utah-era contribution is the machinery: Hall's tetrahedral and cubic press designs advanced how researchers and manufacturers reach and sustain extreme pressure and temperature reliably and economically.

The cubic press, in particular, had outsized industrial reach. Hall transferred cubic-press technology abroad around 1960, and the design family became the workhorse of large-scale synthetic-diamond-powder production — much of the world's industrial diamond powder is now made on cubic presses descended from his designs.

What It Took

The hard problem in diamond synthesis is not only chemistry; it is equipment. Turning graphite into diamond requires very high pressure, high temperature, a metal catalyst, precise containment, and — crucially — repeatability, in a machine that does not destroy itself or contaminate the sample. Small changes in anvil geometry, stress distribution, heating, and sample assembly separate a useful run from a failure.

Hall's response was to change the geometry of how pressure is delivered. The tetrahedral press converged four anvils on a small volume; the cubic press used six. Both were attempts to make high-pressure work more flexible, productive, and reproducible than the original Belt. At BYU he also produced an early form of polycrystalline diamond (PCD), a material important to cutting and drilling tools.

Why It Mattered

The Utah work mattered because it kept Hall — and a cluster of people and companies around him — at the center of high-pressure research after the GE breakthrough. BYU became a real site for diamond-press experimentation and high-pressure apparatus development, and the Provo area gained companies that commercialized industrial diamond and high-pressure equipment.

The deeper point is that materials breakthroughs are often won by whoever can build the machine. Hall's career is a clean example of treating apparatus design as the frontier, and it established Utah as a small but genuine node in superhard materials and high-pressure science.

Utah Context

Hall's Utah connection is direct and durable: a University of Utah Ph.D. who built his post-GE research program and his companies in Provo. BYU's high-pressure work and the MegaDiamond / Novatek lineage gave the Wasatch Front a foothold in superhard materials and industrial diamond manufacturing that persisted for decades. For students and operators drawn to materials, mechanical design, and hard-tech manufacturing, it is one of Utah's clearest examples of academic research feeding a local industrial ecosystem.

People and Institutions

• H. Tracy Hall — synthetic-diamond pioneer; University of Utah Ph.D.; BYU professor and director of research; inventor of the tetrahedral and cubic presses.
• Francis Bundy, Herbert Strong, Robert Wentorf — GE Project Superpressure colleagues; part of the contested credit story around the first synthesis.
• M. Duane Horton and Bill J. Pope — BYU colleagues associated with the company effort that became MegaDiamond.
• MegaDiamond / Novatek ecosystem — Provo-area companies tied to industrial diamond and high-pressure technology.
• US Synthetic — Orem, founded April 1978, the industrial descendant of this line. Bill Pope's son Louis managed MegaDiamond's manufacturing plant for five years, helping design its hydraulic presses, before founding US Synthetic with his father as its first president (Deseret News, 1998); the company says it presses polycrystalline diamond on cubic press technology of its own design. Bill Pope later founded Diamicron to apply the same materials work to diamond-coated orthopedic implants (Deseret News, 2010).

Lessons for Builders

• The instrument is the invention. In high-pressure materials work, the press is the breakthrough; building better apparatus beat chasing better chemistry alone.
• Reproducibility creates industries. The Belt and cubic presses mattered because they made diamond synthesis repeatable, not just possible once.
• Bring it home and commercialize. Hall turned academic apparatus work into Utah companies; the research-to-industry path is a recurring Utah pattern.
• Be honest about shared credit. Hall's GE-era recognition is historically charged; a durable account separates what can be cleanly attributed from what is disputed.

Evidence

• U.S. Patent 2,918,699: Hall, "High Pressure Press" — the tetrahedral press · https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/2918699 — the primary record for the four-anvil design: filed Apr. 28, 1958 from Provo, granted Dec. 29, 1959.
• U.S. Patent 3,159,876: Hall, "High Pressure Press" — the cubic press · https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/3159876 — the six-anvil successor, granted Dec. 8, 1964, and the document in which Hall records its descent from the tetrahedral press.
• National Inventors Hall of Fame: H. Tracy Hall · https://www.invent.org/inductees/h-tracy-hall — source record
• Chemical & Engineering News: First Diamond Synthesis, 50 Years Later — a Murky Picture of Who Deserves Credit · https://cen.acs.org/articles/82/i5/First-Diamond-Synthesis-50-Years.html — source record
• BYU Special Collections: H. Tracy Hall biography · https://archives.lib.byu.edu/agents/people/2364 — source record
• Wikipedia: H. Tracy Hall · https://en.wikipedia.org/wiki/H_Tracy_Hall
• H. Tracy Hall Foundation · https://www.htracyhall.org/
• Source: Deseret News — "US Synthetic got rocky start" (1998) · https://www.deseret.com/1998/6/21/19386584/us-synthetic-got-rocky-start/ — contemporaneous reporting on the commercial line running out of these presses.
• Source: Deseret News — Bill Pope Obituary Feature (2010) · https://www.deseret.com/2010/12/18/20161471/diamond-expert-bill-pope-leaves-behind-legacy-of-hard-work-curiosity/ — on Bill Pope's part in carrying the press work from BYU into MegaDiamond and US Synthetic.

Open Questions

• Which primary records distinguish Hall's documented Belt design and December 1954 run from the contested allocation of credit at GE?
• A megadiamond.md page would be a natural cross-link target and does not yet exist. Neither does one for Diamicron. US Synthetic now exists and carries the downstream half of this story.
• Confirm the exact founding date and corporate history of MegaDiamond and Novatek against primary sources before stating them precisely. The only source the corpus currently holds for the MegaDiamond founding trio is a 2010 newspaper obituary quoting a company CEO (Deseret News) — well-placed but interested, and no registration record has been pulled.