Scrutiny of experimental observations of light bending, one of the determinant proofs of General Relativity, suggests a clue of profound significance; gravity appears to deflect EM radiation proportionally to its frequency. Differences in the deflection of light beams and microwave radiation are minimal, but statistically appreciable. The GEM Experiment proposed in the text aims to employ a tunable source of gamma-rays, about the Higgs resonance, as the one tendered by the LHC facilities at CERN. The gamma-ray source is tunable for being tunable the energy employed to let Hadrons collide. Besides the LHC offers, between ALICE and CMS experiments, a suitable location for future experiments. The text first focuses on the clues that the general theory of Relativity suggests. Those lead to the resurrection of an Ether concept, not in the sense of a rigid structure where to drift through, but in the way of a medium, a fabric where to move. In other words a structural frame where matter shapes as waves shape from water.