A diamond is a solid rock of carbon and the hardest known naturally occurring substance. Because diamonds also have some extraordinary optical and physical properties, intensive research is underway on their use in laser and quantum technology.
have been"grown" for many decades, and the process is exceptional now.
What exactly are lab-grown diamonds and how do they compare with the real thing? Professors Tracey Rushmer and Rich Mildren from Macquarie University explain.Synthetic diamonds are chemically and physically identical to naturally-occurring diamonds, and it can be very hard to distinguish them using the naked eye or even with a jeweler's glass.
In the HPHT method, we place a small fragment of natural diamond to"seed" in a chamber filled with carbon and subject it to Most natural diamonds are between one and three billion years old. They form mainly in old, cold cratons—ancient continental crust structures 150 kilometers or more below the Earth's surface—where temperatures reach 650 to 1,000°C and pressure is up to 100,000 greater than the earth's surface.
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