My Art Glass Lamp Shade?

My husband's family were antique dealers back in the 70's. Since passing last year, I am trying to find out about the many unusual items in their collections. Here is one of them! Art Glass Lamp shade has a beaded pattern which fades away towards the top. It looks like opalescent or maybe Vaseline or other?? The petals are twisted, thorny looking with cranberry color tips. I researched but cannot find any other resemblance to this shade. All glass experts, what is your opinion on who made this wild looking lamp shade? I appreciate any input!!!