Hyperfine parameters and the pressure dependence of the magnetic transition temperatures of FeRhGe2 have been investigated. Sample has been prepared using high pressure - high temperature synthesis technique. FeRhGe2 consists of two B20 structure phases with close lattice constants. The phase separation stays constant in the temperature range 4 - 300 K. The magnetic transition temperatures Tc1 = 213 K and Tc2 = 135 K of FeRhGe2 slightly increases with pressure in the range 0-4.5 GPa. We have compared this pressure dependence with some others compounds in the family Fe1-xRhxGe. The two phases in FeRhGe2 have slightly different values of the hyperfine magnetic fields.