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Iconic American movie star Marilyn Monroe once famously , "Diamonds are a girl's best friend". Scientists from the University of Liege in Belgium they have a gargantuan amount of these precious stones. There could be an 18-km wide layer of the gems beneath the crust of the planet Mercury. Our nearest planetary neighbour could quite literally a celestial jewel. Researchers how Mercury , approximately 4.5 billion years ago. The planet from a gyrating cloud of cosmic dust and gas. Over millions of years, the dust was into graphite, which is chemically identical to diamond. Both are solid forms of the element carbon. It unlikely Mercury's diamonds could ever be as they are about 500 km below the surface.

Researchers used a machine called an anvil press to the conditions under which Mercury was formed. The press is to make synthetic diamonds. Researchers elements inside a graphite capsule. These included silicon, magnesium and aluminium. The capsule was to pressure 70,000 times greater than that on Earth. It was to temperatures of 2,000 degrees Celsius. The lead researcher about the diamonds on Mercury. He said: "Diamonds are made of carbon only, so they should similar to what we know on Earth…They would [] pure diamonds." Scientists there are a quadrillion tons of diamonds beneath the Earth's surface. Experts say the value of these hidden gems pretty much incalculable.