“…In reality both of these arguments are probably overly simplistic; factors like the partitioning of nitrogen into other crystallizing phases, their isotopic fractionation factors, as well as the oxygen fugacity, pressure and temperature conditions probably all play a role. The study of mixed-habit diamonds (Welbourn et al, 1989;Rondeau et al, 2004;Lang et al, 2004;Zedgenizov & Harte, 2004;Howell et al, 2012;2013a) demonstrate differences in nitrogen concentrations between different growth sectors that grew from the same fluid at the same time. This implies that the nitrogen partition coefficient between diamond and the source fluid/melt is not only controlled by thermodynamic or kinetic processes, but simple crystallography and growth mechanisms can also play a role.…”