Your fiance chose a stone at the top of your desired colour range, which was E-H. With ovals, once you get into the H/I/J range - sometimes even at G - you will see patchiness of colour in the stone, because different facet patterns return light differently.
This is the first oval diamond photo that Google images returned.
See the area outlined in red, where the facets look bigger and spread apart a bit more? In an E, that area will look very white. In an H, that area will also look very white. But look at those areas circled in yellow - see how the facets look tiny, and really close together, and the whole space just looks a bit... “mushy”? In an E, those areas will look just as white as the red area. But in an H, those areas will look more yellow/brown than the red area - those yellow areas will show the body tint of the material face-up much more than the red area.
Almost every non-precision cut oval available will have a little of both of these types of facet patterns. By choosing an E, your fiance avoided visible colour zoning face-up.
Your fiance chose a stone of such high clarity that you will never, ever see any inclusions in it, no matter how closely you inspect. Often, when a diamond gets grubby, inclusions become a lot more visible. When you see stones in the showroom they’re always freshly cleaned, and the sparkle makes inclusions almost impossible to focus on. Your stated threshold was eye clean - eye clean is always assessed when the diamond is freshly cleaned and full of distracting sparkle. But after a few hours of wear, once the diamond has picked up skin oils and water residue and lotion and whatever else your hands might encounter, the sparkle is (understandably!) somewhat muted, and any inclusions become much much easier to focus on.
By choosing a higher clarity stone than you requested, your fiance ensured that your diamond will look unblemished even after a full day of wear.
I looked on quickly, and the best 3ct oval that I saw is an F VVS2 priced at $48.1k. Dimensions are 11.19mm x 7.93mm. Yes, it’s bigger than yours - just barely! And yes, I scrolled past several stones that faced up larger, but I wouldn’t have recommended them.
387133 - This Oval Cut 3.00 Carat F Color VVS2 Clarity has a diamond grading report from GIAwww.jamesallen.com
I can’t see much in your photos so I’ll stop here. My general point, though - purchase of any stone is going to involve some sacrifice somewhere. We don’t have any idea how your fiance chose your stone, but I can say right away that his choice mitigated some other potential unhappinesses. Your stone is also set into a halo, which is a size equalizer - that extra quarter mm honestly most likely wouldn’t have had any memorable impact.
Ovals aren’t like rounds. When you’re buying a round there’s a smorgasbord to choose from and you can be as nipticky as you like. With ovals... Especially in larger sizes... Once you’ve decided on narrow colour and clarity ranges, you kinda gotta take what you can get. Maybe you’ll have two promising stones to choose from, if you’re lucky, but most likely of your four or five options one is a clear winner. By having his jeweller call the stone in, your fiance (most likely!) wasn’t trying to take the easy way out, but realized he was way in over his head and that if he wanted to buy an engagement ring any time soon he would do best actually trusting his chosen trusted jeweller.
Please enjoy your new ring! It is beautiful, and your fiance maxed specs out within the parameters that you asked for, and it is proportional on your finger. And it most certainly does NOT look like a 2ct.