If you look at the knop on your candlestick photo you can just see that the base glass is clear. The clear glass thing does break down with the blue stuff...
The Knizek Pandora items are very much in the nouveau style, more artisan. I suspect that the vase on the far right does not belong in that group, the cut rim and simpler shape and to some extent the more 'granular' finish look more like our Hortensja items.