So,

This paper is a few years old, but it appears that back in 2007, its working title was actually “Diamonds unlikely in gas giants like Uranus,” and this was the title of multiple news stories covering the results at the time.

Unfortunately, it seems that the title had been changed by the time it actually made it into PRL, possibly when one of the senior authors actually read the manuscript.

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Ghiringhelli LM, Valeriani C, Meijer EJ, & Frenkel D (2007). Local structure of liquid carbon controls diamond nucleation. Physical review letters, 99 (5) PMID: 17930770