Here, we present a case study of an apatite-calcite segregationary kimberlite from the Andriesfontein pipe (Kaapvaal craton) using EPMA and LA-ICP-MS data of olivine macrocrysts and groundmass phases to constrain magma evolution. The primary objectives are to first constrain magma evolution in the SCLM using olivine followed by late-stage evolution and the timing of fluid exsolution using groundmass phases and importantly, apatite. Olivine cores display a range in Mg# (87.2–93.6) with no distinguishable gap in compositions. Aluminium, however, clearly divides the cores into two populations: 1) high-Al cores (>100 ppm Al; >400 ppm Ca; Mg# 87.2–92.7; 52% of cores) interpreted to predominantly reflect the disaggregation of megacrysts, and 2) low-Al cores (<100 ppm Al; <200 ppm Ca; Mg# >92; 48% of cores) interpreted to reflect sampling of garnet peridotite at depths of 84.5–138 km estimated using the Al-in-olivine thermometer. Groundmass phlogopite and spinel are well-zoned recording evolution of the kimberlite melt with increasing oxidation state indicated by the presence of MUM spinel and tetraferriphlogopite rims. Perovskite trace elements concentrations are typical of kimberlite perovskite worldwide. Apatites are observed in late-stage segregations as both equant grains and radiating clusters of acicular laths, however, their compositions are identical (SrO ∼2.2 wt%, SiO2 < 1 wt%, and low REE e.g., La2O3 + Ce2O3 - <0.01 wt%). The relatively high SrO and low SiO2 suggests formation from a fluid phase rather than directly from the melt, consistent with the presence of apatite in segregations and predominantly acicular habit. Chondrite normalised REE profiles for apatite display sinusoidal patterns, which can be modelled by melt evolution through small degrees of predominantly perovskite fractionation. Ultimately, we present a five-stage model for melt evolution from melt-SCLM interactions to magma evolution through groundmass crystallisation and late-stage fluid exsolution, highlighting the complexity of kimberlite magma evolution from source to surface.