The layers look clean and the colors look very Seguso VA-like. I searched and found some similar vases. These vases were attributed to Flavio Poli for Seguso. There were differences, however. The vases I found had pulled rims that looped and attached to the sides. Like the rim, the handle of these vases were pulled, looped, and attached, rather than pierced as seems to be the case for the vase in this post.
Still... Looking at the layers and colors, I wouldn't be surprised if the vase in this post is Seguso, maybe Poli. To me, the vase looks carefully crafted and very pretty.