No scientist can travel that far underground, so we don't know exactly how diamonds are created. But we know they are formed of carbon atoms coming together under intense pressure and heat to form ...

"The occurrence of ringwoodite together with the hydrous phases indicate a wet environment at this boundary," a team of researchers led by mineral physicist Tingting Gu of the Gemological Institute of ...

Natural diamonds form out of carbon that gets stuck in lava tubes about a mile deep in the Earth's crust. The final purification step converts the carbon into slippery sheets of graphite — the ...