Hi Mero. Thanks for the explanation. The diamond I am looking at is a cushion cut diamond, I am not sure it is considered to something that is unconventional.
Yes. I am very uncomfortable with the fact that it is non-refundable & exchangeable. If I were to reject the first diamond and get the 2nd diamond, I have to pay 110% of the diamond. I don't mind that a deposit is required but I want to have the flexibility to pull out of the deal if the diamond is really not what I expected it to be based on its specs.
Try Jannpaul's cushion brellia. I am getting that.

Another way is for you to get wedding bands which will be cheaper and is for daily wear. And if you want to spend more, can always consider buying a nice watch too. Doesn't need to be a ring