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All data are from Smith et al.1 and cited sources.
Smith, E. M. et al. Blue boron-bearing diamonds from Earth’s lower mantle. Nature 560, 84–87 (2018).
Brenker, F. E. et al. Detection of a Ca-rich lithology in the Earth’s deep (>300 km) convecting mantle. Earth Planet. Sci. Lett. 236, 579–587 (2005).
Anzolini, C. et al. Depth of formation of CaSiO3-walstromite included in super-deep diamonds. Lithos 265, 138–147 (2016).
Brey, G. P. et al. Ferropericlase—a lower mantle phase in the upper mantle. Lithos 77, 655–663 (2004).
Smith, E. M. et al. Large gem diamonds from metallic liquids in Earth’s deep mantle. Science 354, 1403–1405 (2016).
Korolev, N. et al. The origin of Type II diamonds as inferred from Cullinan mineral inclusions. Mineral. Petrol. 112, 275–289 (2018).
Nestola, F. et al. CaSiO3 perovskite in diamond indicates the recycling of oceanic crust into the lower mantle. Nature 555, 237–241 (2018).
Moore, A. E. The origin of large irregular gem-quality Type II diamonds and the rarity of blue Type IIb varieties. S. Afr. J. Geol. 117, 219–236 (2014).
Banas, A. et al. Can microdiamonds be used to predict the distribution of large Type IIa macrodiamonds? A case study at the Letseng mine. In 11th Int. Kimberlite Conf. Ext. Abstr. (Univ. Alberta, 2017).
Milledge, H. J. et al. Carbon isotopic variation in spectral type II diamonds. Nature 303, 791–792 (1983).
Harte, B. Diamond formation in the deep mantle: the record of mineral inclusions and their distribution in relation to mantle dehydration zones. Min. Mag. 74, 189–215 (2010).
Kaminsky, F. Mineralogy of the lower mantle: a review of “super-deep” mineral inclusions in diamond. Earth Sci. Rev. 110, 127–147 (2012).
Dawson, J. B., Keller, J. & Nyamweru, C. Historic and recent eruptive activity at Oldoinyo Lengai. In Carbonatite Magmatism: Oldoinyo Lengai and the Petrogenesis of Natro-Carbonatite (eds Bell, K. & Keller, J.) 210 (Springer, 1995).
Deines, P., Gurney, J. J. & Harris, J. W. Associated chemical and carbon isotopic composition variations in diamonds from the Finsch and Premier kimberlites, South Africa. Geochim. Cosmochim. Acta 48, 325–342 (1984).
We thank T. Stachel for constructive comments. We thank S. Abraham for producing the figures.
The authors declare no competing interests.
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Moore, A.E., Helmstaedt, H. Evidence for two blue (type IIb) diamond populations. Nature 570, E26–E27 (2019). https://doi.org/10.1038/s41586-019-1245-9
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