Salviati & Co. (Murano)

Miniature 'dented' vases, based on Roman designs, produced by Salviati c.1880-1920. Decoration ranges from crackled gold leaf (an effect attained by rolling the molten glass in the gold leaf before blowing it into shape and allowing the expansion to cause the rifts), to coloured chips melted in the gather to plain self-coloured.

Sizes of these illustrated range between 45mm (the green vase) and 65mm (the red vase):

Abstract vase from the 1960s/70s:

'Orrizonte' vase from the 1990s, produced for Salviati at the Venini factory - the two glassworks were, for a time, owned by a single company and all Salviati production was moved to the Venini works and Salviati existed in name only.

This goes toward explaining the Venini-esque colours and design.

Not technically a 20th century piece but I want to show you anyway! - made in 2003 by Luca Nichetto.
Beautifully etched blown glass Amber vase