The article presents a comprehensive analysis of the mineralogical and geochemical features of xenoliths from the V.Grib kimberlite pipe, represented by lower crustal garnet-clinopyroxene granulites and mantle eclogites. A comparative characterization of the two xenolith types is conducted, as clear criteria for their distinction are currently lacking. The study identifies several distinctive features that unequivocally characterize mantle eclogites: elevated Cr contents (in garnets >300 ppm, in clinopyroxenes >1500 ppm), high pyrope content in garnet (>34 mol.%), and evidence of early metasomatism manifested as metasomatic garnet, spongy clinopyroxene replaced by pargasite, and phlogopite rims at garnet-clinopyroxene contacts. Evaluation of the pressure-temperature parameters of the V.Grib pipe xenoliths confirmed the mantle origin of eclogitic xenoliths formed at T = 800-1200 °C and P = 30-50 kbar, and did not refute the initial assumption of a lower crustal origin for granulitic xenoliths characterized by T = 750-800 °C and P = 14-15 kbar. To definitively resolve the issue of identifying lower crustal garnet-clinopyroxene granulites and mantle eclogites, a comprehensive comparison of the isotope-geochemical characteristics of “eclogitic” and “granulitic” zircon is proposed for future research.