Its been a few years since I’ve done my last TCo engagement ring upgrade but back then, they didn’t have the online “pick your own diamond” feature. Feel free to point me to another thread if it’s been previously discussed but, how does that work? OP, have you called ahead to ensure that both these rings will be there for you to look at? In my experience, each store has their own stock and then an internal computer system where your SA can look through the specs near what you desire/your budget and then bring in rings from other stores for you to consider (usually only 1-2 at a time). This process generally took days/weeks. Since you are traveling for this purchase, I just want to make sure the product is there waiting for you. Good luck deciding (my choice is always the classic solitaire!)