In this work the optical and lasing features of 1.2at.% neodymium doped GGG crystals in comparison to YAG (lat.%), SLGO (5 and 10at.%) and YAP (1at.%) ones are presented. Influence of UV and gamma radiations on a change of absorption and luminescence spectra of the crystal is also reported The strong influence of UV radiation of pump lamp on lasing characteristics of GGG:Nd crystals is stated. After cut off UV from pump lamp spectrum the slope efficiency of GGG:Nd laser can be placed between SLGO:Nd(10at.%) and SLGO (5at.%) ones.