Lab grown diamonds are grown above ground and have all of the same properties as mined diamonds do. To get a lab grown diamond you first select a high-quality diamond seed then they are placed in a chemical vapor deposition chamber (like a greenhouse). Hydrogen is then added to the chamber and is ignited, causing methane to be introduced which is the source of carbon for growing diamonds, after 12 weeks the diamond has grown layer after layer. The rough diamond is then precision cut by a laser then faceted into the desired shape and polished using the same tools you use for mined diamonds. Lab grown diamonds larger than 0.24ct are laser inscribed on the girdle of the diamond with LG before a number.