The article reports data on the concentrations of the major elements in garnet (1104 grains) and clinopyroxene (238 grains) xenocrysts extracted from rocks of the crater part of the highly diamondiferous V. Grib kimberlite pipe, located within the Arkhangelsk diamondiferous province. All garnet grains were divided into five color groups: violet (35% of the total sample), orange (40%), red (23%), red-orange (<1%) and dichroic (1.3%). The composition of garnets indicates the presence in the lithospheric mantle of lherzolites (39 %), harzburgite-dunites (up to 8 %, including 4 % of potentially diamond-bearing), as well as a significant amount of megacrysts (23 %), low-chromium pyroxenites (up to 19 %), and eclogites (11 %). The temperature varies from 900 to 1200 °С, which is the most common temperature range of diamond stability in the lithospheric mantle rocks, corresponds to 78 % of lherzolite garnets and 88 % of garnets of the harzburgite-dunite paragenesis, including 95 % of “diamond association” garnets. The bestfit geotherm was determined using the software "Gtherm" according to the calculated P-T values of chrome diopside xenocrysts and was consistent with 36.8 mW/m2 surface heat flux. Reconstruction of the structure of the lithospheric mantle indicates the location of garnets of lherzolite paragenesis throughout the entire section of the lithospheric mantle from ~ 80 to ~ 205 km, harzburgite-dunites, including potentially diamond-bearing varieties, mainly in its central and lower parts from ~ 130 to ~ 180 km. The lower boundary of the lithospheric mantle was established at a depth of ~ 230 km. The thickness of the “diamond window” is ~ 85 km. The results of the study showed that kimberlite indicator minerals from the crater parts could be suitable to predict the potential diamond content of kimberlite objects at the drilling stage.