Multi-stage growth and its significance in Shandong diamonds, China has been comprehensively studied, whereas microanalysis of δ¹³C is absent for diamonds at different stage and inner variation.10 gem-quality Shandong diamond plates were investigated by Second Ion Mass Spectrometry (SIMS) and cathodoluminescence. Associated with cathodoluminescence imaged growth zones, variations of δ¹³C within a diamond from core to rim were concluded.δ¹³C trends to heavier from core to rim within the same growth zone, while the variations are different between multi-phase growth zones. The variations of δ¹³C values in diamonds reveal complication of growth environment and conditions in the region, also provide quantitative data to study the mantle carbon cycle in the North China Croton.