Antique Tiffany Engagement Ring

[Paisley2628]

I stopped by a local jewelry store that carries a lot of "estate" jewelry. They happened to have a 1.6ct center stone Tiffany platinum diamond ring. It was probably a size 5.5 or so meaning it didn't go past my knuckle
I thought I would share pics:

 

[Mreader]

That is a stunning ring!

 

[lavenderdragonfly23]

Antique Tiffany makes me weak in the knees …. That’s actually priced pretty good, depending on the specs.

Thank you for sharing!

 

[Rhd3]

I wish I were in the market. Beautiful!

 

[vintage diamond]

Wow

 

[viggy_luvs_bling]

Always love seeing a good antique Tiffany find!

And feel free to redirect if this is not the right place to ask, but I've always been curious on the authentication process for antique Tiffany rings. I get the setting can be authenticated via hallmarks, design, etc. but there's really not a way to verify the diamond is truly "Tiffany" unless there's original paperwork that matches the stone? Of course, this is before the modern times when T started inscribing # on the stone. And even with a paper trail, one can still debate if someone went through the trouble to forge the papers...

Is my understanding correct, am I missing something?