Thanks for the responses! The finger length is approximately 70mm and the width of the diamond is expected to be 5.76mm thereabouts. The band will be tapered, from 2.1mm to 1.5mm as it approaches the diamond. I would ideally like to stick to a solitaire (am personally a fan of classics) and a RB diamond if possible!
Does she have a Pinterest page that you could snoop around in? Lots of ladies "pin" designs and whatnot of inspiration pieces, whether wedding-related or not.
What kind of setting does SHE want? Don't get what you like, unless she liked it first . If you don't know for sure, you could put most of the budget into the center stone in a plain solitaire for the proposal. Then later, after you save up more, and she can weigh in,
pick a setting for the wedding present, or if elaborate, for an anniversary.
For instance, if my hubby had bought me a halo ring for our engagement, I'd have been elated about his proposal, bit disappointed in the setting. For me, I prefer a center stone to be main stage. I can add bands for blingier days, and add more for super bling. But I can wear a plain band or bands if I just want to see the e-ring.
My (first) ering is a .63 in a solitaire, and it is the star of the ring. I wish I had more pictures of how I change the look with stackers, but here's a couple.