Here's a possibility (but not bigger than 8 X 6):
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From my limited experience
Peachy pink is hard to photograph and come across to a monitor. The pink tends to take over and the orange/peach tends to disappear. Sometimes. Depends on the lighting too.
Plus
I have a pair of pinky brown-ish zircon from multicolor that photograph much pinker than irl, even to they do have a definite pinkness in some lighting. Others it’s straight flat brown.
Looking at the Multicolour stone you linked - my guess is it’s brown. Not peach.
But color is subjective. Your monitor is different than mine.
You may need to bring in a few to learn what you like and how they change in different lighting and irl eye vs monitor.
Best wishes
- it’s your engagement ring right? Take your time and devote a bit of your budget to finding something you can love for a long time.
I love the setting hate the stone not entirely open to new setting but if prongs or basket can be altered but the detailed part left aloneThe AJS and multucolour ones you linked will be brown, not peach.
You need to also consider cut. A horribly cut stone won't look good because it won't reflect light. Its tricky to shop for a specific size, shape, and color. What is your engagement ring setting like? Are you open to changing the entire ring?
No help on the stone but to me in the pictures, that setting looks like it was made for a smaller stone and the current stone is barely set into it
Whether to purchase a lab sapphire is very much a personal decision, If you'd like to discuss-explore that option further, head over to this PS forum, if you've not already spent time there. A couple of currently on-going threads would be of special interest to you.