Carl Walsh

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Kimberlite volcanic rock with mantle crystals (green olivine and purple and orange garnet) and fragments of country rock (light grey).

We used to think diamonds were everywhere. New research suggests they’ve always been rare

Carl Walsh, Queensland University of Technology; Balz Kamber, Queensland University of Technology, and Emma Tomlinson, Trinity College Dublin

Diamonds form alongside a distinct purple companion. We studied it to reach a conclusion about how rare they might actually be.

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