Disappointed customer -NWJ

I wish I had seen the previous posts for the experience of the rings in NWJ. Had bought two sets of rings in November. Wore one so the other one can wear on the wedding day. To my surprise, got married on 23rd Nov then two days later the diamond was gone. Could not understand, not that was a surprise on its own (received the ring on 18 Dec 19). The same or another diamond was gone mid January 2020 but one of the clause has a whole in it. I did raise the issue at the shop of the hole on the clause as the diamond is at risk of coming out from the clause in future. They didn't do anything about the hole only put back the diamond. My problem is to go back to the shop should this happen again for the 3rd time, what happens if it is over that 6 months warranty period as I had problems with the ring with in 2 months of buying it. The staff is friendly though but the rings not what they look like.