IR-transparent $\beta \text{-}\mathrm{Ge}{\mathrm{S}}_2$ crystallized glasses were fabricated by crystallization of the glass with a stoichiometric composition corresponding to target crystal and only $\beta \text{-}\mathrm{Ge}{\mathrm{S}}_2$ crystallites were precipitated. A clear second-harmonic generation was observed in the crystallized glasses by the Maker fringe technique. The optical nonlinear susceptibility, ${\chi }^{\left(2\right)}$ , of $\beta \text{-}\mathrm{Ge}{\mathrm{S}}_2$ crystallized glasses was found to be $\sim 7.3\mathrm{pm}∕\mathrm{V}$ , being comparable to that created by thermal/electric or other poling methods, which opens a new way to an optical converter operating in the mid-IR spectral region.