Hi,
I can't see those particular listings because of the suspension, but looking at the Tiffany item, and after re-reading Ebay's notice to you again, it MIGHT be the link inserted in the description. (Don't know if you had a link in the Gucci one or not, can't see it)
Normally you are allowed a link to better describe the item, but in this case I'm not so sure. Because other than that, your listings look perfectly fine to me. I would go to Ebay Live Help and demand to know EXACTLY what happened. You can see emails are getting you nowhere.
Good luck