The method of Magnetic resonance imaging (MRI) is a non destructive and local one, which is an important requirement in the research of structure formation processes in colloidal systems. This method has recently found some application in different fields of chemistry and material sciences, however, its usage is quite limited. One of the objectives is to construct consistent phenomenological models allowing one to use the parameters being measured within the framework of the given method to describe the processes occurring in the system: solid phase sedimentation, structure formation, phase interfaces, phase transitions etc. The present work involves observing the evolution of water nano-diamond dispersion in the free evaporation process of the dispersion medium under normal conditions. For the comparative analysis two samples with the same mass concentration of 0.3% were prepared  by fractionation from the initial nano-diamond dispersion, one sample being relatively coarse without non-aggregated particles, the other being fine, containing non-aggregated particles. In the course of the experiment, during the whole process of the solid phase concentration at the dispersion medium evaporation, the time profiles of the spin-lattice relaxation T₁ along the central vertical axis of the samples were periodically registered.   The qualitative comparison of the profile behavior with the typical models of inorganic suspension behavior showed that Т₁ was in good correlation with the local density of the solid phase and could be used to describe evolutionary changes of such systems. The result obtained suggests the perspective of the MRI for the research of the evolution of inorganic suspensions with proton-containing dispersion media.