I observed many beetles like this in Pune/India in the beginning of rainy season. It was dark green in color with white spots and not too much shiny like many other beetles. Size is about 2cm to 3cm.
It is certainly a scarab, in subfamily Cetoniinae. It looks very much like a White Spotted Fruit Chafer, Mausoleopsis amabilis http://www.projectnoah.org/spottings/11819281