[en] The qualitative remote order evaluation of crystallographic ordering and the c-, a- and d-sublattices density is carried out; the cations valence states are determined and the primary sort of defects is revealed; the incompleteness of the garnet solid solution sublattices on the basis of the rare earth gallates-germanates is evaluated. It is shown that the gallium vacancies in the a-positions and Gd³⁺₆ are defects in the Gd_3-xCa_xGa_5-xZr_xO_12-δ (0 < x < 0.8) nonstoichiometric systems. Introduction of the In³⁺₆ instead of Ga³⁺₆ leads to the indium vacancies formation