User blog comment:TravelAddict1967/Cersei's wine glasses at King's Landing/@comment-80.251.248.31-20120529160449

Looks like some medieval replica. These guys create similar replicas, but are from Czech. http://www.sklo-turecek.cz/katalog.php   I think this is quite generic medieval/renaissance stuff, so it should  be available in touristic areas in Europe or maybe  renaissance faires.