It's the big,
thick, bright and chunky appearance that leads to a Chinese attribution.
Contmporary Chinese glass is improving all the time, they have imported masterglassmakers from Poland to teach more complicated techniques, even the roughly gouged and semi-polished pontil marks are not being used so often any more...
I try to keep an eye on what is coming out from the far east by having a browse in TKMaxx every so often.

It is a very useful thing to do - it's amazing how much stuff from TKMaxx ends up on "antique" stands at fairs.
Forewarned is forearmed.
They are attractive pieces - I vastly prefer the blue to the amber though.
