I wouldn't rule out Murano completely, at least not until I saw clearer pictures, including one of the base. It's one of those pieces that I find very difficult to attribute as there are a number of contenders. I suspect that a number of people have looked at this piece and wondered without commenting as they have nothing specific to offer.
I should add that I don't mean to imply that because I can't identify it, it's not a very nice piece of glass.
David