I'm probably a little older than you (62) so here's an opinion from a "Boomer who has been there,
done that, and bought the T-Shirt." For what it's worth: Bigger is not always better. Don't worry
about what your friends think/want/have. Make your decisions on what YOU need or want.
Earrings are so easy to lose and believe me, you'll lose a few between now and age 62, so buy a good pair of CZ's, set in the size and gold of your choice and enjoy. Also, consider a set of pearl studs. Yes, I know - pearls? But believe me, with a set of diamond studs, a set of pearl studs and
a pair of good gold hoops, you can throw a pair of jeans, a great white shirt, a black t-shirt, a white t-shirt, a colorful scarf, and a cashmere sweater into an overnight bag and you're set to go for a weekend. Simplify your STYLE now and enjoy a great LIFE style without angst, worry, or hassle and be ready for a spur of the moment trip, opportunity or whatever at a moment's notice.
As for your engagement ring - you'll change your mind alot on that as well. Styles come and go and as your taste changes you'll want to change not just the size of your diamond, but the style/design of your ring as well. What's worked for me: Basic Tiffany solitaire setting. As the years and anniversaries have come and gone, My Honey has presented me with various anniversary bands and eternity rings set in various designs and with varied and different stones. This allows me to match my choice of ring with my outfit, occasion, whim and waterweight with an assortment of rings - with or without my engagement ring or my wedding band. Some days just my simple wedding band or maybe an elegant diamond band or a stacked mix of sapphires and diamond bands. My simple, but elegant solitaire looks and works so well with any of these rings and this system works so well with my life and my life style. It's fun, easy and NEVER boring. Plus, Honey is never at a loss when it comes to buying a present for an occasion. Works for me and as he says, it makes it easy for him.
Just my 2 cents.