‘Chemically, optpically and structurally identical to mined diamonds’ is a description you often hear when laboratory-grown diamonds are being discussed.
But, writes Green Rocks CEO, Leon Peres, what does it mean?
This refers to the fact laboratory-grown and mined diamonds share the exact same chemical composition of predominantly carbon. CVD-grown diamonds are the purest form of laboratory-grown diamonds as CVD typically always produces Type IIa diamonds, the purest form with the least impurities.
Refractive index (RI) is one of the optical properties that gives laboratory-grown and mined diamonds their famous sparkle. The identical RI means that both a laboratory-grown and a mined diamond will have the same brilliance and sparkle as each other.
Another optical property that relates to the RI. As light passes through a gemstone the red light bends the least and each subsequent colour of the rainbow bends a little more with violet bending the most.
This process describes the ‘fire’ of a diamond. Again, laboratory-grown and mined diamonds have the same dispersion and will both have the same beautiful play of colours, or ‘fire’, in two well cut stones.
Hardness is a structural comparison. Both a laboratory-grown and mined diamond score 10 on the Mohs hardness scale. This means there is nothing that can scratch a diamond except another diamond.
Read the rest of Green Rocks’ lab-grown diamond special report here.