Does this have a label or mark saying it is Murano? If someone can help identify the maker, then you might know if this was made on Murano even if it isn't labelled or marked Murano.
I hope I'm not telling you what you already know, but Murano is a place, an island in the Venetian Lagoon, famous for its glasssmaking and its many glassmakers. Again, my apologies if I'm just stating the obvious to you.