So I am planning to propose to my girlfriend soon. At this stage we both pretty much know we will get married, it's just a question of when. I am currently saving up to get her as nice a ring as I possibly can. I know she wants to choose her own ring, but I would still like to have something to give her when I propose (which I still want to be somewhat of a surprise).

So my plan is this: Buy her a much cheaper ring, but still a nice one, that I will use to propose, and then after that we can go shopping together and get her a ring that she picks out. Then afterwards she can wear the proposal ring on a different finger or wear it as a necklace or something. Is this a good idea?

Would it be better to just propose without a ring, and use that money to buy an even more expensive/better engagement ring? Or is it nice that she will have two rings, one that was actually used to propose and one that she got to choose?

Please let me know your thoughts. Thank you.