Cased-glass tumblers

Hi. I am researching these on behalf of my elderly neighbours, who were given them by an aunt in London, so they will be mid-20C or earlier.

They seem to be in the style of the Lidia range by Umberto Nason. I doubt they are originals (pity!) because of the height and the colours, but I expect they may be expensive copies at the time as they are very delicate and made of cased glass.  Height 109mm, diam 77mm. There is no mark on the base

Any info would be greatly appreciated.

Thank you