Has 2 smooth spots on the lamp shade underneath side as shown in the photos. I believe it was made this way because it is smooth.
Murano Style Glass Lamp Shade Millefiori Ruffled 9.5”
Tiffany Style Lampshade Replacement, 6 Inch Simple Leaves Stained Glass Lamp Shade, Handmade Vintage Art Deco Ceiling Light Shade, for Wall Lamp, Chandelier, Floor Lamp, Table Lamp
CraftedGlass Tiffany Style Lampshade Replacement, 6 Inch Warm Blue Leaves Small Stained Glass Lamp Shade Handmade Vintage Art Deco Ceiling Light Shade for Wall Lamp Chandelier Floor Lamp(Warm)
Tiffany Style Lampshade Replacement, 6 Inch Warm Blue Leaves Small Stained Glass Lamp Shade Handmade Vintage Art Deco Ceiling Light Shade for Wall Lamp Chandelier Floor Lamp(Blu)
DC VOLTAGE Tiffany Glass Shades,Stained Glass lamp Shade,Blue and White Fan Shades Wall lamp, Pendant lamp,Replacement Shades (Style 2)