Laboratory Grown Diamonds

How they're formed

Laboratory grown diamonds are atomically identical to natural diamonds, but are artificially created in a laboratory environment. Scientists make cultured diamonds using a process called the Chemical Vapour Deposition (CVD) Process, which grows a cultured diamond from the “seed” of a mined diamond, resulting in an identical DNA match of chemical and physical properties. The diamond slice is combined with carbon and then added to a plasma reactor which replicates the conditions in which a natural diamond would grow. This includes a temperature of over 5,500 degrees celsius and extreme pressure, which converts the carbon to diamond. This process takes 8 weeks, after which a completely unique, grown diamond is formed. It is then cut into the desired shape and ready to find its new home.

Where they're grown

We are proud to partner with predominantly local Australian suppliers who source laboratory grown diamonds from international foundries. 

Diamond Foundry are an ethical, environmentally conscious creator and supplier of laboratory grown diamonds, and are the world's only certified carbon neutral producer of diamonds. Their diamond production is 100% hydro powered by Washington State’s Columbia River, resulting in zero emissions due to the use of renewable energy. 

Utilising both our partnership with Diamond Foundry and our local suppliers gives us the best opportunity to fulfill each individual clients requirements.

Grading System

As laboratory grown diamonds are anatomically identical to natural diamonds, they follow the same grading system. Identical quality indicators exist across factors such as the stone's colour, clarity and fluorescence, and the resulting quality after being cut, such as its polish, symmetry and overall proportions, in addition to the quality of the cut itself. They also adhere to the 4C's, where relevant to shape.


As the colour of laboratory grown diamonds can not be specifically controlled while they are growing, much in the same way as a natural diamond, they are most commonly grown in colours G - I. Though possible, achieving an F or E colour is rare. At NMJ we aim to work exclusively with laboratory grown diamonds that are a G colour and above to maintain the highest quality possible. This is specific to the CVD process, which use no post-treatments to alter the colour of the diamonds to ensure authentic colour quality.


At Natalie Marie we exclusively source laboratory grown diamonds that are created using the CVD process, which does not use any post-treatments to enhance the quality of the diamond. This ensures a stable, genuine quality that will not alter over time. There is a second growing method, called High Pressure High Temperature, or HPHT, which produces lower colour quality diamonds which are then heat treated to improve their colour quality artificially. Many HPHT stones can be graded as D, E and F colours post-treatment, however this is not guaranteed to be stable and the stone has the potential to revert to it's original, lower quality over time, which is why we choose to exclude them from our sourcing.


The laboratory grown diamonds we source are graded by GCAL, IGI or the GIA, and on occasion will also come with a Diamond Foundry certificate of authenticity if sourced through this channel. The diamond grading report is the quickest and easiest way to tell if a diamond is mined above ground, or below ground. Your diamond grading certificate will tell you if the diamond was grown using the HPHT method or CVD process, and will indicate all of the standard quality specifications of the diamond such as colour and clarity grades.  

Just like natural diamonds that have a GIA laser inscription, laboratory grown diamonds will have an inscription on the girdle of the diamond to say that it has been created in a laboratory. This can be viewed under a jewellery loupe or microscope, and will match the identification number listed on the diamond's certificate. 


Laboratory grown diamonds are more affordable than a natural mined diamond, partly due to their shorter growing time, but also because less man power is involved in their creation than in the mining process. As the industry is still in its infancy, projected value is unpredictable as advances in technology are always changing, and the demand for stones is rising, which leads to fluctuations in market pricing.