Red glass shade I think

I am pretty sure this is a lampshade but I can't find others similar to it. It has a crackle glass effect and the red color seems to be painted on. It stands around 6.5" tall and is about 6.25" across the bottom. One interesting thing is if you rub a finger along the glass from the bottom to the top there are sharp edges on the patterns. I will appreciate any help or thoughts on this.

 

yes, a lamp shade; generically the freeform shape is called handkerchief. The important measurement is the fitter size, which is the outside diameter of the cylinder end.
WP examples
Vtg Hurricane Oil Lamp Shade Crackle Green Art Glass Handblown Freeform Ruffled | #1796870031 (worthpoint.com)

Vtg 2 Glass Light Globes Ruffle Fluted Fused Crackle Lamp Shade Globes Art Deco | #3761417766 (worthpoint.com)

Amber Crackle Handblown Art Glass Handkerchief Ruffled Hurricane Oil Lamp Shades | #2060624449 (worthpoint.com)

SET OF 5 VINTAGE HONEY AMBER RUFFLED CRACKLE GLASS CHANDELIER LIGHT SHADES | #2053175548 (worthpoint.com)

 

Thanks you guys. There seems to be some disagreement among the different sellers on descriptions and uses, but you nailed it again. A couple of things I am wondering though. To be legitimately called crackle glass, do the cracks have to be within the glass? These seem to impressed or pressed onto the glass, if that makes sense. One also says they are handblown and I am wondering if that is possible or more likely that they were somehow molded? Thanks again for your efforts.