LeiserDiamonds_Certificats_Labgrown_Facsimile

Lab-Grown Diamonds

Lab-grown diamonds have many different names - lab-grown, lab-created, lab-made, synthetic or man-made diamonds. All these names indicate that these diamonds are produced in a laboratory or factory and do not occur in nature and are thus not mined in the earth.

Some laboratories use advanced technologies to mimic the conditions under which natural diamonds form inside the earth. This formation history is the main difference between lab-grown and natural diamonds. This is because lab-grown diamonds have essentially the same chemical, optical and physical properties and crystal structure as natural diamonds.

There are two main processes for producing lab-grown diamonds:

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  1. High pressure high temperature process (HPHT)

In this process, diamonds are produced in laboratories that mimic the pressure and temperature of natural diamond formation in the earth. HPHT diamonds grow at a pressure of 5-6 gigapascals (5-6 billion pascals) and at temperatures of 1300-1600 degrees Celsius.

This method can also be used to improve the colour and clarity of low-quality diamonds. With the process, diamonds can be coloured not only more colourless, but also pink, blue or yellow. However, the diamond must then be declared as a "treated" diamond.

2. Chemical vapour deposition (CVD)

This newer technique allows scientists to grow diamonds in the lab at moderate temperatures (700-1300°C) and much lower pressure. Carbon-containing gas is pumped into a vacuum chamber where it begins to deposit on a tiny piece of diamond and crystallises as a grown diamond. The final size of the diamond depends on the growth time.

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These artificially laboratory-produced diamonds are also certified by GIA and IGI just as thoroughly and professionally. Their non-natural origin is clearly noted in the certificate. This prevents confusion with natural diamonds.

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