Brittle wedding ring

In December 2020 my husband bought me the perfect wedding ring at Sterns Vaalmall, an exquisite White Gold ring. We received the best service from the sales ladies there, but till date the ring were returned 3 times for repairs. The last time we took it back in July 2022, there was an assessment done on the ring and I was told the ring is brittle to the extreme and it a manufacturing fault. They can replace the ring with something of the same price. If I want the same ring it must be a special order cause they don't have the same ring in their stores anymore. What does this mean for me?? Additional funds, more money. I mean we were already inconvenienced by selling us a brittle ring. Why do we have to pay more for what we were supposed be getting from the get go?? I'm so disappointed in Sterns. The audacity to just want to replace the ring, as if it's nothing, I mean the ring already have sentimental value to it. We eventually decided to not go for the replacement got it repaired again. We got the ring back last year Sept and guess what the ring broke again now in Feb 2023, the ring even turned yellowish. I'm so sad I wish they can eventually sort out this issue without us having to spend more as the ring was expensive already.