At first glance, based on dome, smooth round base, use of aventurine, and curve of ribbons, your weight is Murano, from the Venetian lagoon in Italy. This one is a little more interesting than others I've seen bcause of the deep blue of the ribbons and the lack of a central millefiori cane at the top of the crown. Usually these paperweights have the cane from which the ribbons and altenating aventurine flow.