This paper presents the study of ceramic Pb1-3x/2 Lax (Zr1-y Tiy)O3, x/80/20 and x/70/ 30 solid solutions, where x = 6, 8 and 10%, which show a relaxor behavior with diffuse phase transition. It was possible to observe clusters of nanoregions characteristic of relaxors by means of polarized light microscopy using a lambda plate, which improves the birefringence of phases present in ceramic solid solutions. The structure pattern of clusters clearly shows two interference colors, which could be associated to tetragonal and rhombohedral distortions of perovskite unit cell, typical for compositions in the boundary region.