"The court case centres on the production of Synthetic Diamonds using a process known as chemical vapour deposition ... Upon exposure to high energy, the gaseous molecules break up into plasma containing carbon atoms. The carbon atoms are then deposited on the substrate, growing the Synthetic Diamond layer by layer"

https://www.straitstimes.com/singapore/s-pore-maker-of-lab-grown-diamonds-wins-seven-year-court-battle-against-de-beers-firm