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Acknowledgements

We thank T. Stachel for constructive peer review and B. Luth for discussion on mineral stability.

Author information

E.M.S. prepared the manuscript with contributions from S.B.S., S.H.R. and F.N., and expert approval from E.S.B., J.W. and W.W. All authors were involved in this Reply.

Competing interests

The authors declare no competing interests.

Correspondence to Evan M. Smith.

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Fig. 1: Additional features consistent with a sublithospheric origin for the large 24.18-carat blue type IIb diamond (sample 110208093607, from the Premier kimberlite pipe at the Cullinan mine).

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