I just sadly took that beautiful Apple green leather case off of my iPhone 13 Pro. I love how it looks, but I've been using it since Friday and one corner of it is already black. Same thing happened to last year's blue leather case (this one was very black by the end of 6 months). Not dirt, just the color rubbing off.
I've loved every Apple leather case I've had until last year and this year. They just don't age at all. Really stinks. I hope it works out better for you, but I'll be taking mine back and hoping someone else makes a nice green leather case