While it might be early days and too soon to present a real threat to diamond giants De Beers and Russia’s Alrosa, there is a development that is sure to set their nerves aflutter.

An international team led by researchers at Australian universities has found a way to make diamonds using just the pressure at room temperature instead of the more conventional combination of pressure and tremendous heat of more than 1,000°C in which natural diamonds were made millions of years ago in the earth’s crust — or in laboratories...

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