Abstract
In the deposit n.a. Y. M. Lomonosov three groups of diamond crystals were distinguished on the base of morphology, photoluminescence, infrared absorption features and the thermal history. The crystals of the first group are octahedrons with minor signs of dissolution. In the first group, crystals have a high proportion of nitrogen in the B form and the high model temperature. The crystals of the second type is highly resorbed dodecahedroids, they has low proportion of nitrogen in B form. The third group consists of crystals with the low temperature C defects, they are cuboids and resorbed tetrahexahedroids. These patterns indicate the polygenicity of the diamond in the deposit after M.V. Lomonosov.
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