Wedding is in four days and have impulsively decided to purchase a double bail solitaire pendant from Blue Nile (ER and studs also from BN). Need opinion on size of stone. Earrings are .40 each, ER is 1.51 and was considering .50 - .60 for the pendant. Also looked at .40 with bezel setting but not sure if she would like the appearance. We both like F, VS2 and platinum so will continue with those specs to be consistent. Based on the size of the other pieces and her figure (5''1, 105 lbs, size 3 ring), is a half carat appropriate and worth the price (total budget is < $2,500)? Should I pass and purchase something larger for Xmas or another time? Thanks!