sorry Ivo, it's still quite difficult to tell on your pics.
The bubbles in mine are very evenly matched shape and size and are distributed over the entire piece like the back view of the pendant.
I did find a berluze vase by Andre Delatte last night that had a close up pic of the bulbous foot of the vase. It was multi coloured as well and had these same bubbles in. I didn't think it would be possible to make a berluze vase from pate de verre, so perhaps its the way the colours have been laid out and gathered on the marver that make this bubble effect as well as pieces made by Pate de verre?
I think my pot is old, does your tray or cheese board have that feeling? The colours and combination feel old to me.
I'll try and find the pic again and add it for your comparison.