The vase was made by Sowerby. The pattern number of the vase is 2437.
Bottom line on the value - if your vases are Carnival Glass, then they are valuable. If they are not Carnival then they are not worth as much.
It's impossible to put an absolute price on an item like this in Carnival. As I said, they are scarce and sought after. In the right auction, in the right place at the right time, they could sell very well. Another time - another place - it could be a different story. The two auction figures that Dave quotes are good guides for the value.
But note that things like excellent iridescence (I am assuming they are Carnival - if they're not then forget big dollar prices) and perfect condition will be very important.
There is plenty of information within the Carnival collectors circles about these vases - but I don't know what more I can give you than I have already said.
And of course, re. Anne's wise comments earlier, your vases may not be Carnival. When you post your pics then we'll all know for certain.
Glen