Are diamonds forever?

They may be a girl's best friend, forever or simply the hardest natural substance, but they also may not be quite so rare as chemists once thought. “Diamond formation in the deep Earth, the very deep Earth, may be a more common process than we thought,” explains Dimitri Sverjensky of Johns Hopkins University, in Baltimore, Maryland, USA. Writing in the journal Nature Communications with doctoral student Fang Huang, the team offers a new quantitative theory of diamond formation. Of course, rarity is also about access and just because a theory of formation suggests that diamonds form more readily than once thought does not mean that they will be near the Earth's crust ripe for mining and marketing.