Should I return the diamond rings I bought?

I bought 2 diamond rings on sale at Macys. I am a shopper and can't resist a deal. I bought them whereby I can pay them off in 24 months which will come to $300 A month. I can swing it but I am so guilty keeping the rings. I have two days to decide whether to bring them back. I have very bad depression and therefore I have a problem making decisions. A part of me wants to keep the rings, escpecially since I paid a third of what they were originally priced at. I just am very worried that after the month I can't return them and then I have this payment for the next 2 years. What should I do? I just can't make a decision and I have no one to ask. I am so torn. I am having a hard time returning them although I probably will feel relieved if I do. The other problem is that I am unhappy in my marriage and am worried if anything happens down the road and I need the money, I will have this payment to deal with. Any suggestions is appreciated. I know this sounds silly but I just can't make a decision. Thanks.