Bulk magnetic measurements and $^{99}\mathrm{Ru}$ and $^{155}\mathrm{Gd}$ M\"ossbauer effect investigations were performed to examine magnetic properties of the gadolinium pyrochlore ruthenate ${\mathrm{Gd}}_{2}{\mathrm{Ru}}_{2}{\mathrm{O}}_{7}$. A magnetic transition to the antiferromagnetic state at ${T}_{N}=114(1)\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ is accompanied by a small difference between field-cooled and zero-field-cooled magnetic susceptibilities. $^{99}\mathrm{Ru}$ and $^{155}\mathrm{Gd}$ M\"ossbauer effect investigations at $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ confirmed that both ruthenium and gadolinium sublattices are magnetically ordered. Successful analysis of each spectrum with one set of hyperfine parameters proves that all ruthenium moments have the same magnitude and form the same angle with the local three-fold symmetry axes. The same conclusion concerns Gd magnetic moments. The measured temperature dependence of the hyperfine field at Gd site, together with the molecular-field model, points to the fact that Gd moments also order at ${T}_{N}$, with tiny magnetic moments due to Gd-Ru exchange interaction.