Two methods are used to create synthetic diamonds in the laboratory setting — chemical vapour deposition (CVD) and high-pressure, high-temperature (HPHT). Regardless which process is used, these laboratory-grown diamonds are composed of the exact same crystallized isotropic 3D pure carbon, the same as mined diamonds.
Synthetic diamonds are often referred to as cultured or cultivated diamonds, and they are authentic diamonds that have been created in a laboratory as opposed to being created by a geological process. Synthetic diamonds are not to be confused with simulated diamonds or imitation diamonds which are really just crystals such as cubic zirconia — synthetic diamonds are 100 percent real and identical to mined diamonds in terms of physical and chemical properties.
Currently, in the UK, two methods exist for creating cultivated diamonds: