Abstract
Structural impurities and defects in diamonds from placer deposits of the Near-Sayany Region were first investigated using the IR-Fourier spectroscopy technique. The diamonds are dominated by individuals (the main population) with relatively low both the total nitrogen contents and the degree of its aggregation in the crystals. For the most part, these diamonds are characterized by a laminated structure of the faces (octahedra, rhombododecahedra, and their transitional forms) and are similar to diamonds from pipes of the Daldyn-Alakit district in Yakutia. It is suggested that the primary sources of diamonds of the main population from the placers of the Near-Sayany Region were represented by kimberlite bodies.
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