  We show that a metastable dark matter candidate arises naturally from the
conformal transformation between the Einstein metric, where gravitons are
normalised states, and the Jordan metric dictating the coupling between gravity
and matter. Despite being secluded from the Standard Model by a large scale
above which the Jordan metric shows modifications to the Einstein frame metric,
dark matter couples to the energy momentum tensor of the Higgs field in the
primordial plasma primarily. This allows for the production of dark matter in a
sufficient amount which complies with observations. The seclusion of dark
matter makes it long-lived for masses $\lesssim 1$ MeV, with a lifetime much
above the age of the Universe and the present experimental limits. Such a dark
matter scenario has clear monochromatic signatures generated by the decay of
the dark matter candidate into neutrino and/or $\gamma-$rays.
