3 Glass Bowls Some Form of Cut Glass?

Picked up 3 bowls, stands 2" tall and measures 5" across the top. The bottom has wear consistent with age and use. But someone thought these were something...all 3 have permanent sticker residue. They sparkle color in the sun. Are these some kind of cut glass? I can't find any marks.

 

They are probably moulded glass but have had the bases ground flat during production. This design would be hellishly difficult to cut due to the form so unlikely unless they were high end and expensive.

 

Thanks Ce BCA