I M Chaney Antique Furniture has dated this piece to the 1910s.
This glass vase was designed by Georges De Feure (1868-1943.)
He designed many pieces for the Art Nouveau pavilion at the Exposition Universelle of 1900, including a handful of decorative objets in glass.

This vase is moulded in cloudy amethyst glass with ‘slag’ inclusions that give it the appearance of being carved out of a piece of rock. It features a very crisp freize of Classical dancers and musicians. It is in exceptional condition, with De Feure’s moulded signature on the base.
Measuring
Height 14 cms
Width 12 cmd
Depth 12 Cms
I M Chaney Antique Furniture has dated this piece to the 1910s.
You can view the stock and full dealer information on the I M Chaney Antique Furniture Profile Page