Women's Diamond Ring (Withered)

I bought this diamond ring two years ago in Dubai I don't have the receipt and I don't know anything .. but the purchase price was approximately 7000 Riyals .. Whoever wants to buy it, I'll go with them to any jewelry store so they can verify it .. I made a mistake by resizing it when I bought it, and now it's too tight on my finger; also, the color of the ring has changed on the back side .... Of course, the color can be fixed, but the problem is that it's too small for my finger .. I'm selling it for the highest price possible .. but I hope you don't lowball me .. I want to sell it and get another one, so I want a reasonable price