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While most of us are happy to slap some peanut butter between two slices of bread, scientist Dan Frost of the Bayerisches Geoinstitut in Germany did something a little bit different with his peanut butter: He made a diamond. Frost studies the conditions of Earth's mantle and has found ways to mimic them in his lab. high pressures of the mantle can strip oxygen from carbon dioxide and leave behind the carbon to form a diamond. And since peanut butter is already rich in carbon, Frost was able to transform the nutty goodness into a shiny jewel.