Can anyone tell me when this wedgwood jasper ornament was made or if its worth anything?

Send a photograph of it to the Stoke on Trent City Museum in Hanley, Stoke on Trent, Staffordshire. Wedgwood often did the same design in different colours, (blue, green, black and occasionally a rather nasty pink and a yellow) but I think that most of the old ones were blue. Green is more likely to be 20th century I think. But the museum will tell you for sure.