And another one - this would stay in your budget and not much of a size difference 
http://www.jamesallen.com/#!/loose-diamonds/round-cut/0.55-carat-j-color-vs2-clarity-ideal-cut-sku-73814
Good luck, hope you can get your ring in time!
http://www.jamesallen.com/#!/loose-diamonds/round-cut/0.55-carat-j-color-vs2-clarity-ideal-cut-sku-73814
Good luck, hope you can get your ring in time!