My answer sounded a bit curt, it wasn't meant to be, I was posting during my short lunch break. There is a lot of glass masquerading as Murano. Made in Italy invariably means it's almost certainly not made in Murano. It might be made in Italy somewhere but there is also a lot of Chinese glass that is supposedly, according to the label, made elsewhere.
The Muranese are very proud of their traditions and put Made in Murano on their labels. It's a minefield out there because even Made in Murano is no guarantee. The word Murano without the Made in often means it's not from Murano, just Murano-style (if there is such a thing).
These bowls are not badly made but the label along with a base that looks like it's been shown the coarsest grinding wheel (plus the fact that I found two side by side) flash red warning signals.
Pix taken indoors on new phone so a bit wobbly