I had my solitaire princess cut diamond put into a setting purchased from rogers jewelers in 07. Since then every four to six months I was taking it to rogers to have the diamond tightened, as it would constantly come loose! The last time in august they told me they had to re-tip the prongs but that it was all fixed. A week ago I looked down and my diamond was gone! Rogers said they only guarantee their work for six months and so they will not replace my diamond. I feel because of how many times I had it in for repairs they are liable? Should i sue or not???