Recently scientists succeeded in forming meteoric diamond (hexagonal diamond or lonsdaleite) by laser heating graphite at high pressures. See { Synthesis of bulk hexagonal diamond | Nature }. In this discussion, the author, Reginald B. Little (RBL), proposes that the formation of lonsdaleite is favored by graphitic precursor enriched in 13C for forming hexagonal lonsdaleite diamond relative to natural diamond extracted from the earth and synthetic diamond. RBL proposes such on basis of his theory of different chemical kinetics and bonding dynamics of 13C relative to 12C; different more extreme conditions for lonsdaleite formation; the different crystal morphology of lonsdaleite relative to cubic diamond (having same C-C bond lengths) involving two different bond lengths; the tetrahedral bonding in classic cubic diamond from side view manifesting A, B, C stacking crystal morphology due to the equivalent C-C sp3 bond lengths; the two differing tetrahedral bonding lengths in lonsdaleite causing side view with A , B stacking crystal morphology; the 58% harder crystal strength of lonsdaleite relative to classic cubic diamond; high pressures and laser synthesis of longsdaleite inducing fractional, reversible fissing and fusing of 13C by RBL's theory for favoring and enriching 13C-13C bonds bond regions; the discovery of lonsdaleite in Canyon Diablo Meteorite in Arizona with known enriched 13C isotope in larger nodules of the meteorite { 2567.PDF }; "The δ13C values (a measure of isotopic enrichment) range from -7.91 to -10.27 ‰ for large nodules, with a peak at -9.7 ‰" { 2567.PDF }; the meteor had traces of Ni and Ga which may explain recent formation of diamond in liquid metal alloy { The Canyon Diablo meteorite | Space Science Reviews }; the smaller scale synthesis involved a temperature gradient at high pressure which likely fractionated the 12C and 13C during the diamond growth for lonsdaleite morphology { General approach for synthesizing hexagonal diamond by heating post-graphite phases | Nature Materials }; the more recent synthesis using bulk graphite likely involve 13C enriched graphite as is common from the earth { Synthesis of bulk hexagonal diamond | Nature } ; Intrinsic fractionation of 13C from 12C within the interior of the earth often enriches 13C in carbonate (for subsequent enriching 13C in the graphite from carbonate and 12C in some other graphitic materials {Experimental high temperature carbon isotope fractionation involving graphite - Astrophysics Data System } so starting with graphite may intrinsically have greater 13C to form lonsdaleite by applying high pressures and laser heating due to enriched 13C in the graphite ; the author here (RBL) previously proposed that 13C could more efficiently under intense laser irradiation and rotation activate fractional fissing and fusing by the theory of RBL for more rapidly hybridizing sp3 of 13C for denser bonding for forming BC8 superdiamond { Decomposition of PFAS and Synthesis of BC8 Super-Diamond: Rotations of Electromagnetic Waves for Novel Chemical Dynamics | European Journal of Applied Physics } .