I am wanting to make a three stone ring....I have 2 rounds at .33 each. One color D and the other E. I am looking to get a 1.3- 1.4 carat round. My question is that should I buy a larger stone as a D or E, or can you get away with it being an F or G??? I want them all to look the same, but wondered if you would really notice much difference using the F or G. Thanks---