We examined five diamonds with N-V centers (samples 21–25; figures 5 and 10): two naturally colored, two multi-treated, and one irradiation-treated. Samples 21 and 22 were brownish pink and very light pinkish brown natural-color diamonds that showed weak orange to red fluorescence under both long- and short-wave UV lamps. Samples 23–25 were red and deep pink diamonds that had undergone combination treatments (HPHT + irradiation + annealing; samples 23–24) or standard irradiation + annealing treatment (sample 25). The treated diamonds exhibited red fluorescence under both LWUV and SWUV lights.