Me 4+ -bearing (Me 4+ = Sn, Ti) dravite analogs were synthesized in the system MeO 2 -MgO-Al 2 O 3 -B 2 O 3 -SiO 2 -NaO-H 2 O at 700 °C and 4 / 0.2 GPa in four hydrothermal experiments. Tourmalines form rosette-like aggregates and needle-like crystals that are chemically homogeneous. Tourmaline crystals obtained in high-pressure runs (4 GPa) are much smaller (up to 0.1 × 2 μm) and have lower Me 4+ (0.27 wt. % SnO 2 , 0.57 wt. % TiO 2 ) than those from the low-pressure (0.2 GPa) runs (up to 1 × 5 μm; 1.77 wt. % SnO 2 , 2.25 wt. % TiO 2 ). Synthetic analogs of rutile, quartz and coesite were obtained in the system TiO 2 -MgO-Al 2 O 3 -B 2 O 3 -SiO 2 -NaO-H 2 O, whereas synthetic analogs of cassiterite, tin-rich (up to ~19.55 wt. % SnO 2 ) Na-pyroxene, MgSn(BO 3 ) 2 (Mg-analogue of tusionite), quartz and coesite were synthesized in the system SnO 2 -MgO-Al 2 O 3 -B 2 O 3 -SiO 2 -NaO-H 2 O. We suggest that at a high temperature (≥ 700 ºC), the pressure negatively affects the Ti incorporation into the tourmaline structure. In contrast, at relatively low pressures, the Ti incorporation in tourmaline structures is governed by the Ti content in the mineral-forming medium. Low-pressure conditions are feasible for Sn incorporation in the tourmaline structure. The presence of Ti 4+ and Sn 4+ cations in structures of the synthesized tourmalines (probably at octahedrally coordinated sites), is also indicated by changes in the unit-cell parameters.