Despite nearly a hundred years of investigation, the puzzling conflict between general relativity and quantum theory remains unresolved. This discussion will focus on a general relativistic toy model for which an approximate quantum treatment can be given, and we will be concerned about whether or not this idealized system can exhibit the phenomenon known as "gravitational decoherence". Originally suggested by Feynman in the '60s and notoriously advocated by Roger Penrose since the '80s, gravitational decoherence is claimed to result from taking the effects of spacetime curvature into account when forming quantum superpositions. We will discuss the plausibility of Penrose's arguments, and the possibility of observing this effect using a general relativistic thin-shell interferometer.