Cartier do a really beautiful, delicate eternity band if you're looking? Pretty reasonably priced for the brand - https://www.cartier.com/en-gb/etincelle-de-cartier-wedding-ring_cod25458910981759032.htmlI’m in a similar position - sorry for your loss.
I’m thinking a 5 or 7 stone diamond ring, sparkly but still wearable day to day. Originally I was looking at eternity rings but couldn’t find any I loved. I’m mostly leaning towards a ring because it could be engraved.
I really like solitaire diamond necklaces too, I know Cartier have one but an independent jeweller might be better.
Also like the thought of having some really pretty jewellery (maybe earrings) only kept for special occasions that could be passed down.