A transparent gadolinium-rich oxyhalide glass scintillator was developed for gamma ray spectroscopy with an energy resolution of 14.0% at 662keV. To the best of our knowledge, this is the highest energy resolution reported for a glass-based scintillator. The high gadolinium content facilitated a scintillator density of 4.4g/cm(3). The high fluorine and bromine incorporation is advantageous for better uniformity and a good light output of similar to 3200Ph/MeV. The peak emission at 431nm with a FWHM of 90nm, resulting from the fast Ce3+ transitions, yielded pulse-height spectra with distinctive peaks from 122keV to 1.33keV for gamma radiation from different nuclides.