<p>In this study, aluminosilicate glasses incorporated with 10&#xa0;wt% Gd³⁺ were synthesized using the conventional melt quenching method. X-ray diffraction confirmed the amorphous nature of both pristine and doped samples. Raman analysis revealed that the Qⁿ distribution of SiO₄/AlO₄ tetrahedra remained essentially unchanged after doping, indicating that Gd³⁺ incorporation does not significantly alter the glass network's polymerization. Electron paramagnetic resonance (EPR) measurements showed resonance signals for both Fe³⁺ and Gd³⁺ ions. The addition of Gd³⁺ induced a decrease in the peak-to-peak linewidth (ΔHₚₚ) and a shift in the resonance field (H_r) of the Fe³⁺ signal at g ~ 2.302(3), providing evidence for the onset of antiferromagnetic interactions between Fe³⁺ and Gd³⁺ ions and a modification of the Fe³⁺ local environment. Vibrating sample magnetometry (VSM) revealed that Gd³⁺ incorporation increased the magnetic susceptibility and introduced a ferromagnetic component, quantified as 19% of the magnetic response, compared to the purely paramagnetic/antiferromagnetic behavior of the pristine glass. Optical absorption studied by UV–Vis spectroscopy showed broad bands associated with electronic transitions of Fe³⁺ and Gd³⁺, while the optical band gap remained unchanged at approximately 2.6&#xa0;eV<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\pm 0.02\)</EquationSource> </InlineEquation>. These findings demonstrate that Gd³⁺ incorporation significantly tailors the magnetic properties of aluminosilicate glasses introducing ferromagnetic interactions and modifying antiferromagnetic coupling without altering their amorphous structure or fundamental optical band gap, making them promising for magneto-optical applications.</p>