Chemical Vapor Deposition (CVD) is the widely used method for producing Lab-grown diamonds, where microwave power is sometimes used to assist the growth process but which limits the growth area. However, Qi Liang and Russell J. Hemley along with colleagues of Carnegie Institution, Washington have introduced a 75kW, 915 MHz microwave plasma-assisted CVD systems that can help in significantly scaling up high-quality diamond production.
The system can now aid in growth of single crystal diamonds at a high rate and deposition area using very pure hydrogen and methane gas. With an estimated production rate of 100 grams per day and identification of a growth-annealing co-process that improves the optical quality of CVD diamonds, it is a major breakthrough for Lab-grown diamonds production.
Source: Su, X. (2014), “Mass Production of Synthetic Diamond”, Crystal Growth & Design/ACS Publications, Wiley-VCH Verlag GmbH & Co. KGaA, ChemistryViews