How Lab-Grown Diamonds Are Made

Since the 1950's, attempts have been made to create diamonds in laboratories. Over these decades, various techniques have been applied to create these man-man lab-grown diamonds but today the most refined techniques are namely High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD).

Both these methods are highly complex and require highly sophisticated machinery. The first method, HPHT, replicates the exact conditions where diamonds grow naturally in the depths of the earth, whereby a microscopic diamond seed (pure carbon) is placed in a sealed chamber and exposed to extreme pressure and temperature. The temperature reached is in excess of 4,700°F (2,600°C) and extreme pressure of more than 50,000 atmospheres is applied.

Once these optimum conditions are attained, the carbon seed dissolves into the now molten catalyst which is then carefully cooled over a period of six to ten weeks. During this time these carbon atoms gradually build onto the diamond seed thus creating a new gem. Each stage of this process is highly critical and there can be no fluctuations in the conditions or else the resulting diamond will be flawed and unusable for jewelry purposes. At the end of the process, the new lab-grown diamond is removed and will be cut and polished in exactly the same manner as a natural gem.

In contrast, CVD is a very different technique whereby a diamond seed is placed in a vacuum chamber and lower pressure is applied to a hydrocarbon gas. These gases are typically methane and hydrogen which are then heated to an extremely high temperature, resulting in the decomposition of the hydrogen to form pure carbon atoms (diamond). The release of these carbon atoms then drop and attach themselves to the original diamond seed much like dew droplets, gradually building into a new gem layer by layer. Once formed, the resulting rough gem will then be cut and polished using the same conventional methods as a mined diamond.

CVD tends to have several advantages over HPHT. The first and foremost is that this chamber has no restrictions regarding the size, hence it is thus possible to produce larger lab-grown diamonds using this technique as opposed to HPHT. The second advantage of using this technique is that it tends to produce more colorless gems, whereas HPHT shows a slight color tint.

Whichever technique has been applied to produce your desired gemstone, GEMIFIQUE guarantees the quality and ensures that it has been created with the utmost care and precision.

We have the knowledge, experience and expertise to ensure that the diamond jewelry you buy from us will be the best choice you have made!