The transmittance, luminescence, and Raman spectra in PbI₂ microcrystals of 2H polytype, grown in the voids of alkali-borosilicate glasses (void dimensions 4-30 nm), are investigated. Depending on the conditions of growth, the exciton states of the microcrystalline systems were found to shift toward higher energies by 35-60 meV relative to the free exciton energy in bulk single crystals as a result of the quantum-well effect. The resonant Raman spectra of PbI₂ microcrystals exhibit not only the conventional Raman component A_Ig, but also components associated with the appearance of the E_u and A_2u optical phonons and the two-phonon processes.