The gravitational instability of a dusty plasma with ion dynamics take
n into account is studied. For the range of parameters relevant to pla
netary rings and interstellar media: we demonstrate that the inclusion
of ion dynamics cannot cause additional destabilization of a gravitat
ing dusty plasma system. Streaming of the cold ions, on the other hand
; enhances the Jeans condensation of a dusty plasma. Consistency of th
e results with previous work and new aspects arising owing to consider
ation of ion dynamics is discussed.