Ok, thanks for answering and editing my post.
I also think it's bohemian, but what about the one from the antique store? If you compare the pattern, you notice that it's identic, only varied a little bit. I found some other vases with gilding that look similar but no one comes as close as the vase from the store I mentioned. Even the antique market's vase comes closer than the pictures I found on google.
Apparently Poschinger, Josephinenhütte, Harrach and others made very similar pieces in aventurin glas, as they looked over each other's shoulder. So maybe it actually is really difficult to come to an exact provenance.