I have no specific examples saved that I can point to. I have collected Italian glass off and on for about 20 years and the finish on the base of this, and others I see on ebay occasionally are unlike any Italian house I am aware of. Also, IMHO the general look and feel of some of these pieces seen more recently is just not "right" to me.
The Chinese are getting very adept at producing Murano like glass, and I have had pieces you would swear are early Nason and others, that are not Italian in origin. They are actually reasonably good at producing some Czech style glass now also and I have purchased some examples of that and also the Murano style glass to study for tell tale signs.
In the case of this example above, the circle of white in the ground base is a trait one sees on Chinese glass that I do not see on Italian produced glass. That trait alone would keep me from identifying this as a piece of Italian production. Additionally, the completely crude flat grind on the base is not indicative of any Italian house I have any experience with... modern or other, and it is quite indicative of Chinese production.... Yes they are getting better at details like this, but some of it is still produced rather crudely.
We also see Murano style glass coming out of South America (Brazil), but generally that glass is better quality than this, especially when it comes to finishing details and overall execution.
I am attaching an example of a Chinese bowl that is offered on ebay quite regularly as Italian glass by sellers, and the base exhibits the same characteristics as this piece does, especially the ring of white. It is obviously larger on the piece pictured below.
Both my instincts, and also what I know and understand about Italian glass tells me this is not Italian. That is the best I can do for now.
A wise researcher once told me if three things point away from an attribution then it is not. I would point to the following three things I see as pointing away from Italian production:
1) Colors are not quite right, at least to me
2) Circle of white on the base of the glass
3) Crudely flat ground and unpolished base
Hope it helps.
Craig