Board Thread:General Discussion/@comment-25156739-20150914163822/@comment-31404278-20200924010126

Well, Star Platinum, at very best, it City Block+ (CB+). Stone Free is Multi-City Block, and Jolyne herself has MCB level durability. Jotaro likely also has CB durability, such as Star Platinum, but that's still a big gap.

Jotaro, also, doesn't scale to Jolyne, and same for their Stands. He has nothing close to solid that can support this.