Hi - i was recommended the following diamond from a sales guy, other than the thickness of the girdle, could you take a look and let me know if its any good? thanks!
One thing that jumps out is skinny arrows. I suspect the actual lower girdle length to be 81~82%. It is neither good or bad. Do you like chunky fires or small pin fires? Do you like broad bright white reflection from the red area, or do you prefer more balance between the contrast (arrows) and brightness? https://www.youtube.com/watch?v=-9FtRj_IG9Y https://www.youtube.com/watch?v=Bzaqez6q8jQ
Double check if the stone is truly eye-clean (notably the inclusion under the table at 12:30)
There's certainly nothing wrong with it. But it is a particular flavor of round that will look slightly different especially from the 'super-ideals' that many prefer here.
But it should be bright and doesn't show leakage and is very nice, in terms of performance. As FP said though, the light is going to more splintery and sharp. Almost like the extra facet round designer cuts.
A modern round brilliant consists of 58 facets (or 57 if the culet is excluded). Round diamond with cuts of more facets than that are usually branded, and since there are more facets in the same space the facets are smaller. They tend to show a less strong contrast pattern than a 'typical' super ideal. It's a very bright look. Like I said, there is nothing wrong with it. It's still a round brilliant, so it's not going to look like those that FP linked you to, just MORE like one of them than a standard super ideal with a strong contrast pattern would.
If you like it, I would have that design, NOT full eternity (diamonds stop at 10 and 3), made for your stone by David Klass or IDJ. Or at least ask them for quotes on it and ask them if they can do it for you for 2k. I would NOT buy the BN version (even if it was in budget).
It's basically this one, without that weirdness at the head breaking up the shank.