Pop the question with a lump of coal?

How big a diamond could you make with the carbon in a piece of coal?
14 February 2020
Presented by Megan McGregor
Production by Megan McGregor.


A solitaire diamond ring


Listener Paul got in touch wondering, given that diamonds are made of carbon, how big a diamond you could make if you turned all the carbon atoms in a lump of coal into a sparkler. Would it make a worthwhile engagement ring? Getting her hands dirty to find out the answer, here's Cambridge University materials scientist Megan McGregor...


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