Genesis of kimberlite diamond

Evidences of hot accretion of the Earth and the formation of kimberlites from residual melts of the lower peridotite layer of the magmatic ocean are given. They explain the high content of melt components in diamonds, later their formation in the history of the Earth and explain Clifford's rule. The diamonds were crystallized as a result of the accumulation of carbon in the residual melt, an increase in the degree of supersaturation of the melt by carbon during magmatic fractionation led to a change in layerwise growth by radial and the evolution of the crystallomorphology of diamonds in the direction octoctahedra to dodecahedroids and then to cubes and clusters. This explains the formation of faceted microsculptures. The accumulation of impurities in the melt is the reason for the increase in the content of nitrogen and light carbon isotope in the late diamonds.