Welcome to the forum! I think it's a modern decorative bottle although hard to tell for sure what it is without being able to see the whole thing.
It has no seam and a blue patina all over it View attachment 220363View attachment 220364View attachment 220365
It's a blown bottle but I can't tell exactly what not enough of the bottle shown in the picture maybe some decorating piece got a nice colorIt has no seam and a blue patina all over it View attachment 220363View attachment 220364View attachment 220365