What's the biggest diamond I could put on this premade ring/setting without it looking unbalanced?

[DenverDiamonds]

Im really liking this ring / setting for the price. But im just afraid the diamond im looking at might look a little top heavy on this ring. The diamond im looking at is a round 2.35 carat diamond. Do you think it will look okay in the ring? Or what size carat diamond would look best in this setting?