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Researchers used a 
 machine to simulate the 
 under which Mercury formed. The machine is used to make 
 diamonds. Researchers made a 
 of silicon, magnesium and aluminium inside a graphite 
. This was subjected to 
 70,000 times 
 than Earth's. It was heated to 
 of 2,000ºC. A researcher speculated about the diamonds on Mercury. He said: "They would [resemble] 
 diamonds." Scientists believe there are a 
 tons of diamonds beneath the Earth.