Hi guys, I'm planning to propose to my GF after almost 8 years being together. After studying about the 4C, I've chosen what should be the best bang for my bucks (hopefully). Would need some help if the below diamond spec and ring setting are reasonably priced? Quotes are from Audreys.

Diamonds:
4.30 - 4.32 x 2.64 mm, 0.30 carat, Color Grade F, Clarity VVS2, Cut : Excellent , HCA score 1.3 : ~RM3450

4.32 - 4.34 x 2.60 mm, 0.30 carat, Color Grade F, Clarity IF, Cut Excellent, HCA score 1.7 : ~RM3661

Ring Settings:
Tiffany 6 prongs solitaire setting, 18k White Gold : ~RM1,200
Tiffany Harmony-like setting (6 prongs) : ~Rm2,500

Does the difference between IF and VVS2 really that obvious to the naked eyes? I mwill request for the idealscope and videos from Audreys. At the meantime, any other good recommendation on other jewelers? Thanks in advance.