Lab-Grown Diamonds


10:28 AM

1 min read
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India is playing a significant role in the lab-grown diamond industry, positioning itself as the world's second-largest producer of precious stones created in laboratories rather than extracted from the earth.

About Lab-Grown Diamonds

  • Laboratory-grown diamonds have essentially the same chemical, optical, and physical properties and crystal structure as natural diamonds.
    • Like natural diamonds, they are made of tightly-bonded carbon atoms.
    • They respond to light in the same way and are just as hard as natural diamonds.
  • The main differences between laboratory-grown and natural diamonds lie in their origin.
  • Lab-grown diamonds are diamonds that are produced using specific technology which mimics the geological processes that grow natural diamonds.
  • The diamond simulants such as Moissanite, Cubic Zirconia (CZ), White Sapphire, YAG, and others are used to make them look like natural diamonds.
  • How are LGDs produced? There are multiple ways in which LGDs can be produced.
  • High pressure, high temperature” (HPHT) method:
    • It is the most common and cheapest method.
    • This method mimics the conditions under which natural diamonds are formed inside the earth.
    • To produce the lab diamond, a large machine is fed a certain amount of carbon materials that it then crushes under pressures of more than 870,000 lbs. per square inch at extreme temperatures ranging from 1300 – 1600 degrees Celsius.
    • Lower-quality diamonds, whether natural or laboratory-grown, can also be put through the HPHT process to improve color. This process can also be used to change the color of diamonds to pink, blue or yellow. 
  • Chemical Vapor Deposition (CVD):
    • This technique enables scientists to grow laboratory-grown diamonds using moderate temperatures (700°C to 1300°C) and lower pressures.
    • Carbon-containing gas is pumped into a vacuum chamber and deposits onto a diamond seed, crystallizing as laboratory-grown diamond.
    • The eventual size of the diamond depends on the time allowed for growth.
  • Application of Lab-grown diamonds:
    • Used for industrial purposes, in machines and tools and their hardness and extra strength make them ideal for use as cutters.
    • Pure synthetic diamonds are used in electronics as a heat spreader for high-power laser diodes, laser arrays and high-power transistors.
  • India produces more than three million lab-grown diamonds a year and accounts for 15 per cent of global production.

Q1: What is Carbon?

It is a very abundant element. It exists in pure or nearly pure forms – such as diamonds and graphite – but can also combine with other elements to form molecules.

Source: Will the sparkle of India’s lab-grown diamonds last forever?