Set of all glass lamps

I inherited these two all glass lamps from my grandmother. They are all glass the base and the lamp shades. They do not have the wires any longer but do have the inside that holds the light bulb and the switch is attached to that. They are in mint condition no scratches or nicks of any kind. There is a beautiful flower design and "criss cross" design on the lamps shades and the base is a solid clear "frosted" glass. My grandmother told me that they are worth quite a bit and if she passed she would want me to sell them but I dont want to sell them with out knowing what I have. So if anyone knows anything please let me know. My family believes it could be Steuben glass but a collector I talked to online said he didnt believe so but that it may be Tiffin and he also said he had not seen anything like it. There are no marks or signatures to go on. They are very beautiful and we would rather a collector that would appreciate them have them instead of being "packed away" I hope to find some information on these soon!! Thanks for taking the time to look at my lamps.

Excellent