This is a vintage Bourjois cobalt blue perfume glass bottle, designed for decorative purposes and collectibility. The bottle is a standalone piece often used for vanity or display in a collection. It is not handmade or modified, featuring a classic design typical of perfume bottles from the era. The cobalt blue color adds a touch of elegance and sophistication to any space, making it a sought-after item among collectors of decorative glass and perfume-related memorabilia.