Looking for a nice quality promise ring for anniversary thats budget friendly!!

For some context me and my girlfriend are coming up on our one year anniversary (March 22) and I want to get her a promise ring. Issue is I’m not the best at finding good jewelry and I’m on a small budget id prefer something under the $50 range but I’m willing to spend more for a good ring. Gold is preferred but silver is just fine. I just need recommendations on where to shop for rings that won’t oxidize that are budget friendly and are nice looking. Cherry on top is if it has some pink jewels. Shes around a size 6~6 1/2 and all the rings I’ve found either arent her style, her size, or are a little too expensive for me. Any suggestions would be greatly appreciated.