The effect of incubation and aging on cassiterite type tetragonal rutile SnO 2 nanocrystals employing green synthesis technique has been investigated. The incubation and aging affected the compositional and morphological properties of SnO 2 and not influenced the structural properties of nanocrystals. The incubation and aging further influenced the particle shape and size of the obtained product. XRD results of the obtained product unambiguously revealed the cassiterite type tetragonal rutile phase of SnO 2 nanocrystals. The characteristic Raman peaks observed at 249, 476, 631 and 773 cm -1 were respectively revealed infrared active (E u ), Raman active (E g ), (A 1g ) and (B 2g ) vibration modes of pure tetragonal rutile SnO 2 structure. 3d 3/2 and 3d 5/2 of XPS peaks observed at 496 and 487 eV was clearly revealed the Sn 4? state in tetragonal rutile structure. The obtained TEM micrographs clearly revealed that the grain size and agglomeration was increased at higher incubation and aging treatments.