Pop the question with a lump of coal?

14 February 2020
Presented by Megan McGregor.

DIAMOND RING

A solitaire diamond ring

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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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