Is the glass full of bubbles (pulegosa), or am I seeing something else? I have piece of purplish pulegosa that I've never been able to identify, but Mexico was a suggestion from someone, which would make sense where you are. The glass in the piece I have is quite light with very frothy bubbles.
The piece doesn't look Murano to me, although the technique (fenicio) is typical Murano.
I hope this is a start for you.