Lab-grown diamonds are created using advanced technology that mimics the natural diamond-growing process. They're produced via two methods- HPHT (High Temperature High Pressure) and CVD (Chemical Vapour Deposition).

In the HPHT diamond-making process, a diamond seed is subjected to extremely high pressure and high temperature within a specialized machine. A carbon source, typically a mixture of graphite and a metal catalyst, is introduced into the machine. Under these conditions, carbon atoms from the graphite adhere to the diamond seed, gradually enlarging the crystal. This results in the formation of a larger diamond over time, replicating the natural growth process within a controlled laboratory setting.

In the CVD method, a diamond seed or substrate is placed in a sealed chamber. The chamber is filled with a mixture of carbon-containing gases, such as methane and hydrogen. These gases are then activated, typically using microwave energy or other methods, which breaks down the molecular bonds and allows carbon atoms to deposit onto the diamond seed. Over time, layer by layer, the carbon atoms accumulate and form a diamond crystal.