Online photo:
https://www.jamesallen.com/mobile/l...y/round-cut/1.27-carat-i1-clarity-sku-4463101
I uploaded some videos online, if you google "james allen 1.27ct grey diamond" you will see it

Not confident of linking here as I'm on mobile currently.
In fact I understand what you mean and recently my colleague told me he'd be scared of getting a yellowish diamond online.. but I looked at the JA picture and it was ok + I really thought I could return the diamond if I didn't like it, lol. There is a cloud on the diamond but because of its dark tone, most of the time I can't see it. I think this tone is quite a nice balance between clear and opaque/black which won't show any facets already.
I did do a fair amount of research specifically on coloured diamonds and this diamond passed my criteria (not to mention it's very unique as most grey diamonds are either included/uneven colour/much smaller carat), so I got it.
Edit: Oh yes and why I made my decision was because for white diamonds, they are very common and everyone knows how to critique them but for a grey coloured one, it's mostly just less common and inherently less comparable.