With the thought that every cause produces its consequence, It is understood that nothing should be random. When using the model TX2011 (http://ds.iris.edu/) it was found that in regions of Archon Lithosphere, each region may have particular behavior (100 to 300 km depth) that is believed to be due to its individual preterite history. If the proposal of Evan M. Smith and his collaborators was real; about him Deep Origin of the World's Biggest Diamonds, this should show a something in deep mantle regions. The 1D seismic model TX2011 It suggests that between the 525 km at 650 km of depth kimberlites type International, Diavik, etc. (where no large diamonds were reported) depict a different path to the kimberlites/areas with mega-stones diamond (Cullinan, Lesotho, Karowe, Koidu). Paraguayan lamproites (north, shown in the figure in shades of green) show this Cullinan-road. The same was seen for Argyle and Bunder lamproites ... perhaps the proto-magma in them was generated at a lower depth? or should we take special care to exploit Bunder?