A rapid spectrographic method for the quantitative assessment of trace element constituentsin diamond is described. Of the fourteen elements looked for in twenty-five diamond specimens only eight made their appearance, with Si, Mg, Al, Ca, Fe and Cu the most important.

The color of diamond is linked, at least in part, with the presence of Fe and Cu. Type I diamonds are found, in general, to be more impure than Type II diamonds. Very little difference is observed as regards the nature and amounts of the impurities in Types IIa and IIb diamonds.

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