I have seen on websites how many settings have a maximum diamond size. Usually somewhere around 2 carats. Why is this? If I get a custom setting made, what considerations are there for larger (approx. 2.5 carat) diamonds? I want a fairly simple x-prong solitaire setting. I think I want the band to be in the 3.0 mm to 3.2 mm range. Is there any reason why a band such as this would be too narrow for a 2.5 carat diamond? Are there any other things to consider when having a setting custom designed for a larger diamond?