Since its introduction at the Very Large Telescope Interferometer (VLTI), the GRAVITY instrument has emerged as a key player in interferometry. Recognizing its substantial contributions, the European Southern Observatory and the GRAVITY consortium have embarked on an initiative to enhance the instrument's functions. This initiative, named GRAVITY+, aims to broaden the instrument's utility for the international astronomical community and foster new areas of research. GRAVITY+ incorporate advanced features such as a novel laser Adaptive Optics system and an improved fringe tracker to augment interferometric observation sky coverage. This paper details the development of a new Germanium (Ge) prism. This new technical capability of GRAVITY+ will serve to substantially increase the spectral resolution of the instrument to approximately R~15000. The design process, along with the scientific rationale underpinning this advancement, are thoroughly examined in this study.
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