This is indeed a Murano weight.
While the Chinese make the occasional super magnum flower, it is quite uncommon for them to do so.
Murano, on the other hand, makes them with more regularity & I own several examples.
The flower petals, probably applied rather than made with a crimp, are consistent with Murano coloring & style.
Also, this weight has a polished, perfectly round base, as opposed to Chinese bottoms which have a frosty finnish & irregular shape.
I hope this is helpful