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The synthesis of well-cristallized diamond has been achieved by a wide varity of CVD techniques including plasma assisted methods. This paper reports low pressure flat flame combustion growth at still higher O2/C2H2 gas ratios and a new Raman feature at about 1280 cm-1 which was observed in some experiments in addition to the expected diamond peak at 1332 cm-1. Using data from previously published work on a similar flame composition, it was speculated that the locations in the flame yielding diamond (as opposed to non-diamond forms of solid carbon) correspond to regions of the highest atomic hydrogen mole fraction (partial pressure) which in turn is closely related to the highest partial pressure of numerous reactive hydrocarbon radicals including the methyl radical. The increased oxygen/acetylene ratio needed for diamond deposition in these experiments may well be related to the much lower than adiabatic flame temperature expected and observed in previous work on oxyacetylene combustion at low pressure using a water cooled flat flame burner.