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J2 Materials is a privately owned advanced materials company specializing in the growth of high-quality diamonds. Leveraging over 30 years in crystal growth and manufacturing scale-up, J2 Materials is focused on the production of high purity lab-grown diamond to meet the growing demand for ethical gemstones and diamond substrates for the semiconductor industry.

Meet The Team


Jonathan Levine-Miles


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Jonathan is a solid-state chemist who received his B.A. in chemistry from Princeton University and doctorate in materials chemistry from UCLA as a National Science Foundation Fellow.  Upon completion of his PhD, Jonathan spent five years at Rubicon Technology developing novel solutions to manufacture large-scale sapphire crystals for optical and semiconductor applications.  Jonathan was responsible for the installation and operation of Rubicon’s 100,000 square-foot crystal growth facility and the annual production of $100M in materials. As Rubicon’s Director of Technical Business Development, Jonathan worked with numerous fortune 500 clients, as well as the United States Department of Defense, developing new crystal growth and manufacturing solutions.


Jonathan's 12 publications have received over 871 citations worldwide, he is listed as an inventor on three patents and has raised over $7.5M in funding for high-quality crystal growth projects throughout his career from the National Science Foundation, the Department of Defense and the investment community. 


John Ciraldo


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John first became interested in single-crystal materials for electronics applications while studying electrical engineering and physics at The Ohio State University. He obtained master’s degrees in physics and material science & engineering at The University of California at Riverside, where he continued materials research, developing novel processes for chemical vapor deposition (CVD) and molecular beam epitaxy (MBE). It was there that John first began working with carbon allotropes. John has 15 years of experience developing and characterizing epaxial films and has developed technology used in multiple fortune 500 companies, The DOE, DoD and USAF for epitaxial gallium-nitride devices.

John has experience running research and development and intellectual property development for one of North America’s largest semiconductor materials companies. He has authored 16 patents and 11 scientific publications and has chaired multiple working groups for SEMI – all related to standards-setting for semiconductor wafers.

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