  The lutetium dihydride LuH2 is stable at ambient conditions. Here we show
that its color undergoes sequential changes from dark blue at ambient pressure
to pink at ~2.2 GPa and then to bright red at ~4 GPa upon compression in a
diamond anvil cell. Such a pressure-induced color change in LuH2 is reversible
and it is very similar to that recently reported in the N-doped lutetium
hydride. However, our preliminary resistance measurements on LuH2 under
pressures up to 7.7 GPa evidenced no superconductivity down to 1.5 K.
