Comment on “Giant dielectric permittivity of detonation-produced nanodiamond is caused by water” by S. S. Batsanov, S. M. Gavrilkin, A. S. Batsanov, K. B. Poyarkov, I. I. Kulakova, D. W. Johnson and B. G. Mendis, J. Mater. Chem., 2012, 22, 11166

We comment on the investigation of dielectric properties of detonation-produced nanodiamond as reported by S. S. Batsanov et al. (J. Mater. Chem., 2012, 22, 11166) and state that to measure dielectric (electric) properties of powders, the right concentration of material should be determined, suitable equivalent electric circuit selected and dielectric properties of the material should be restored according to the appropriate effective medium equation.