I personally would not want a diamond that is 3.8 carats. For me, that would be too large and too flashy. Some women love that size, though. So before you go that large, make sure that's something your wife would want.The 2 you posted, one 3.8c and the other 2.9c, do those have the good cut that you all are experts at here? Should I contact them about those two, like do I ask for the idelacope images etc or not necessary?
Meanwhile, if you haven't checked it out, MamaBear posted a diamond over at Whiteflash: https://www.whiteflash.com/loose-di...rity-round-ideal-cut-lab-sku-p223285?a_aid=PS
If it were me, I would be comparing the 2.64 carat at Whiteflash recommended by MamaBear with the 2.91 carat at Frank Darling recommended by DejaWiz. But if you are sure your wife would want a 3.8 carat diamond, then throw that into the mix, too.