I started dating my now fiance three years ago, and by the third date knew she was the one I wanted to be with. My advice to any guys who read through here to find out what type of rings your possible future wife would want, proceed with caution. I noticed a lot of women post about how they love their ring, but a lot that post how they don't love it.
When I was dating her in college for our first year I made it a point to look at the jewelry she had in her box, not in a creepy way but more like a research way. I noticed patterns like she doesn't have a lot of heart shaped jewelry, and the few she had, I never saw her wear. Same with Flower shaped jewelry. She also didn't have a lot of diamonds/stone settings. A few pearls that she wore to fancy occasions but a lot of hand crafted stuff.
I bought her some hand crafted Tiger head earrings from Mimosa, because it was local to Baton Rouge and we went to LSU. Geaux Tigers. She loved them. But that was the first piece of jewelry I got her and she only really wears them to LSU events. But it was enough to dip my toes in to start asking her questions, which I kept in the notes section on her contact, next to her favorite flowers and other miscellaneous things.
I found out she doesn't really like diamonds, except for a few cuts, Round and emerald for rings. Round and Marquise for earrings. She also doesn't like Natural diamonds but prefers lab-grown. This is a preference thing but for her ethically she wanted humanely sourced diamonds and likes the idea of lab growing them, again, a preference. If you are buying jewelry, especially an engagement ring, for her to wear for life the little details make a big difference.
She is artsy and likes unique jewelry so when I was shopping I found a beautiful Asscher cut diamond set with two smaller emeralds on the side and almost bought it. I also borrowed a ring she wore on her ring finger to the jeweler to get it sized, I also got it cleaned cause I felt guilty for digging in her jewelry while she was out of town. We went to a christmas party where my cousin had recently got engaged and bought his fiance an emerald cut on a gold band, and she oogled it for hours and talked about how beautiful it was for literal days. She said other than the gold band the stone was what she always wanted.
Realizing that I messed up, and was buying a diamond I thought would look cool and different, I realized that she was going to wear this on her finger for hopefully the rest of her life, I had the ring fitted with an emerald lab grown instead of the Asscher. I proposed and she did nothing but talk about how beautiful it was for 3 months and every now and again when we are outside on a sunny day, talks about how beautiful it is. I bought a platinum band as it is a stronger metal and I wanted it to last forever, and she doesn't particularly like gold jewelry.
Rings mean a lot to a girl, so do the research, pay attention to what she wears and what she talks about, and don't let another person, to include yourself sway your decision. I still think about it to this day how I almost bought her the wrong stone, and that she would have most certainly said yes, and tell me she loves it. I am glad I got it right the first time and it is a big decision. I am not saying to dig through your girl's jewelry box, but take note of stuff she wears regularly throughout the week, and ask her subtle questions.
Some tips/great life advice is when she is on insta and sees another girl get engaged, ask how "What do you think about that ring?" She will be honest about it and you can eliminate different cuts. Write this info down in her contact card, as woman never check there. Another easy way to determine what metals she likes is to ask to look at some photos from Christmas parties, family functions, places where she dresses up, and see what metals are the earrings and necklaces made of.
I feel like this thread has some guys reading it for advice and I hope this overly long post helps them out.