Historically, Baccarat was most famous for the pansy motif. If you look at lots of them, there are certain things that indicate a typical Baccarat pansy; much as you would recognize a Van Gogh as being different from a Monet.
The Chinese made many copies - some very good - of the traditional French motifs. This one that Alan has noted is very pretty, but the swirling white ground is not usually seen in French Baccarat pansies, and the colors of the glass are also different. The more you look and study, the more you learn.
In short, if you are going to collect paperweights, you need to educate yourself on what you are buying. Know that this weight may be very nice, but it is not an antique French piece, and you would not want to pay an unrealistic amount: $850. as opposed to $150. I don't intend to sound condescending, but you need to be smart before spending money or you will lose money. Buying paperweights is best when you choose something because you love it and it "speaks" to you, but there is also an element of intelligent investing so as not to be taken in by unscrupulous dealers. Kind of like doing research before buying a car or an appliance...