  Consider a stratified space with a positive Ricci lower bound on the regular
set and no cone angle larger than 2$\pi$. For such stratified space we know
that the first non-zero eigenvalue of the Laplacian is larger than or equal to
the dimension. We prove here an Obata rigidity result when the equality is
attained: the lower bound of the spectrum is attained if and only if the
stratified space is isometric to a spherical suspension. Moreover, we show that
the diameter is at most equal to $\pi$, and it is equivalent for the diameter
to be equal to $\pi$ and for the first non-zero eigenvalue of the Laplacian to
be equal to the dimension. We finally give a consequence of these results
related to the Yamabe problem. Consider an Einstein stratified space without
cone angles larger than 2$\pi$: if there is a metric conformal to the Einstein
metric and with constant scalar curvature, then it is an Einstein metric as
well. Furthermore, if its conformal factor is not a constant, then the space is
isometric to a spherical suspension.
