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We consider a gravastar model made of anisotropic dark energy with aninfinitely thin spherical shell of a perfect fluid with the equation of state$p = (1-\gamma)\sigma$ with an external de Sitter-Schwarzschild region. It isfound that in some cases the models represent the "bounded excursion" stablegravastars, where the thin shell is oscillating between two finite radii, whilein other cases they collapse until the formation of black holes or nakedsingularities. An interesting result is that we can have black hole and stablegravastar formation even with an interior and a shell cons tituted of dark andrepulsive dark energy, as also shown in previous work. Besides, in one case wehave a dynamical evolution to a black hole (for $\Lambda =0$) or to a nakedsingularity (for $\Lambda > 0$). This is the first time in the literature thata naked singularity emerges from a gravastar model.

Gravastars with an Interior Dark Energy Fluid Forming a Naked Singularity