Although I do kind of understand her sentiment. If the roles were reversed I'd probably say the same thing. I wouldn't really care what the ring was. The only tricky part is that I think she doesn't care as long as its within her preconceived parameters and I only have a foggy idea of what those parameters are.
It's not for me to tell other people what's important to them, and everyone is different. I chose to surprise my wife on the ring style and the timing of the proposal, but she was not surprised by the stone type or proposal.
BUT, this is a great opportunity to practice some communication skills. If it were me, I'd prefer to do a bit more digging to see what is important for her. Marriage works best when you're on the same team. If she wants you to surprise her with a ring style that exemplifies your love for her, that sounds fun! Roll with that... but if there are other parameters, you might want to sit down and walk through your concerns. This isn't necessarily a hill to die on, but it's also an important discussion to have... it's about getting on the same page for finances, and it will certainly not be your last conversation about finances! And if it were me, that's how I'd present it. There's no real end "goal" of the conversation other than try to become aware of each others' concerns.
Is is that she's worried that you're not committed if you don't spend enough? Or is it a cultural image that she has of the marriage process? What are her rules and who is making them? Family traditions are more important than ones passed down through TV commercials, for instance. She might just want a good proposal story to tell her friends. A the end of the day, the process isn't just about her, it's about both of you. You're saying yes just as much as she is!
I absolutely agree with this.
Either she truly is completely laid back about the whole thing and genuinely will love whatever you give her no matter what you choose, or she's got some romantic notion in her head that you will surprise her with a perfect ring.
We don't know her, so it's impossible for us to say.
However, I would ABSOLUTELY find out if she has opinions about vintage/used rings, diamond stimulants, or other gemstones.
You really REALLY don't want to be spending a few thousand on a fake diamond if she hates that idea. You also really don't want to blow excessive thousands on a mined diamond if she doesn't have a strong preference for them.
If you really, genuinely think that she would be thrilled with anything, then it seems very silly to waste thousands on a piece of jewelry that doesn't really matter to her that much.
If it's the far more likely scenario that she doesn't want to help pick it out because that takes away from the magic and fantasy of it all...
...well, then in my personal opinion, of having been engaged a few times, this is the perfect opportunity to have your first challenging couples finance conversation.
This is a huge sum of money that you are looking to spend. If she has expectations and preferences, she needs to be able to voice them to you.
Being able to discuss important financial decisions is far more romantic than having your boyfriend read your mind and magically surprise you with exactly the style and size of ring that you want.
Or, you could just throw money at the problem, buy her a 1+CT round, brilliant stone with a high quality cut, a good colour, and a decent clarity rating, set in a 4 prong white gold setting, and you will probably be fine because that's the style the vast, overwhelming majority of women want and get.
But that's several thousand more than you *need* to spend to get a large, stunning ring, and it's thousands that then can't be put toward her dress, the wedding, your honeymoon, etc, etc.
And that's what this whole place is about. Not wasting money unnecessarily.
If what she really wants is a large, natural diamond ring and you are happy to pay for it, then cool. However, it's borderline nuts to spend that kind of money on an unethical item that will lose 80-90% of its value the moment you buy it unless it's what you've both decided *together* is the best use of that money.
For that money, if she likes moissanite, you could buy her a large ring, earrings, a necklace, and a bracelet.
Just sayin'