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GREEN ROCKS SPECIAL REPORT: Natural vs lab-grown diamonds – what’s the difference?

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Green Rocks

‘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?

Chemical composition
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
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.
Dispersion
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
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.

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