The high-temperature annealing of type-IaB diamonds which contained platelets caused the latter to be converted into dislocation loops, with the formation of octahedral defects. The chemical composition of these octahedral defects was investigated, and they were found to contain molecular N; thus showing that they were the same as the voidite defects which were observed in natural diamonds. This illustrated the last stage of the N-aggregation sequence in diamonds. The amount of N in these artificial voidites was found to be similar to the amount of N in the platelets before their conversion into dislocation loops.

The Nitrogen Aggregation Sequence and the Formation of Voidites in Diamond. I.Kiflawi, J.Bruley: Diamond and Related Materials, 2000, 9[1], 87-93