It looks newer because it is stated in the listing that it has been polished.
I've seen many listings on eBay and I can see that these are the photos that I previously seen elsewhere. Does not mean you will receive a fake ring but most likely it will not be exactly the one you see. One of the pics in this listing is the same as one from the other listing, for example. Sometimes people just take someone else's photos just because they look nice.
You can ask for photos of the actual ring and then study them.
Regarding taking it to Tiffany's for cleaning: we discussed it here before that this is not a 100% guarantee for many reasons: SA may not be skilled enough, or not attentive, or may not care too much.
Guaranteed authenticity would be some servicing like polishing by Tiffany or other services. This is where they would have to take the ring in, send it to the workshop where specialists would examine it with scrutiny. Cleaning is a nice method just for some inner peace but typically I rely on my own judgment here.
Another option for you is to try and look for the rings which come with the original Tiffany valuation reports.
Very good to know about pictures not being of the actual item potentially. I cant believe they would do that with jewelry and these up close detailed images. I supposed I could pay for polishing and hopefully it would be done within 30 days so it would give me some sense of authenticity at least. How much does polishing cost and any idea on turnaround with COVID? Historically looks fairly cheap ($50?) and around 2.5 weeks is what I'm seeing