Oblique cut glass lampshade.
The lampshade is decorated with gold and transparent motifs.
Glass bubbles have been incorporated into the transparent motifs, which makes it seem as if silver-coloured paint has been used. In other words, the cap shines in these places.
These types of caps are used on various types of fixtures.
You could place a shade like this on a table fixture with the shade straight up.
You used to see these shades on a large ceiling lamp, often several glasses were placed.
The most open side then pointed up.
Vintage lampshade, shows normal traces of use.