Wikipedia
Gemesis Inc., now known as Pure Grown Diamonds, is a privately held company located in New York City. The corporation grows synthetic diamonds using proprietary technology. Gemesis has the world's largest facilities for both the high pressure–high temperature (HPHT) and chemical vapor deposition (CVD) diamond production methods. Using these methods, Gemesis has produced high-quality colorless and fancy color diamonds that have been offered for sale at 20–30% lower prices than mined natural diamonds of similar quality (and, from some suppliers, lower prices than that). Gemesis is the principal producer of gem-quality lab-created diamonds and jewelry. The company was renamed as Pure Grown Diamonds in June 2014.
Gemesis started marketing its diamonds by cutting and polishing them and then selling them to jewelry retailers on the wholesale market. In 2012, the company began also selling polished diamonds and diamond jewelry directly to consumers through its website.