  Here we constructed a charged gravastar model formed by an interior de Sitter
spacetime, a charged dynamical infinitely thin shell with an equation of state
and an exterior de Sitter-Reissner-Nordstr\"om spacetime. We find that the
presence of the charge is crucial to the stability of these structures. It can
as much favor the stability of a bounded excursion gravastar, and still
converting it in a stable gravastar, as make disappear a stable gravastar,
depending on the range of the charge considered. There is also formation of
black holes and, above certain values, the presence of the charge allows the
formation of naked singularity . This is an important example in which a naked
singularity emerges as a consequence of unstabilities of a gravastar model,
which reinforces that gravastar is not an alternative model to black hole.
