The methods and results of emission spectrographic analysis of thirty-three diamonds are described. Thirty elements were analyzed for and thirteen were detected among the thirty-three diamonds. The elements Al, Si, and Ca form a persistent group which appeared as minor elements in every specimen. The elements Al and Si exhibited ‘sympathetic’ variation in each diamond. Absorption spectra in the ultra-violet region revealed the presence of a type 2 diamond which was found to be the purest of the thirty-three diamonds. Diamonds from some of the geographical localities show similarities in minor element content. The elements Fe and Ti tended to be present in the colored diamonds. A minor correlation was made between the crystal habit and the simultaneous presence of Ag and Ti. No correlation was observed between minor element content and fluorescence phenomenon.

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