DOUBLE PRETTY IN PINK GLASS VASES

I have a pair of lovely pink glass vases that have a flowing of white that looks like a marbling in some areas of the glass ,the rim at the neck of the vase and also at the bottom, they are thick and heavy, my first thought was that they are case glass, but the colors are not solid , more frosted, I love the bottle shape, am I in error calling them vases could they be actually bottles