If I choose an implant size that's a cm below my BWD will I end up with a gap? (photos)

In Primary breast augmentations in petite people with small breasts it is hard to get anything larger than 450 without significant risks of long and short term complications. I would get another opinion of a board certified plastic surgeon before you have any of these surgeries.

Breast width diameter is only one factor your surgeon will use to help recommend the right implant for you. Volume, shape, placement, and profile will all work together to get you your desired look. During surgery I use sizers to help get my patients the look they are wanting. I've included a video that I hope you find helpful.

After I measure and discuss goals with my patients, we then look at pictures of women (my patients) with similar measurements with different size and style breast implants and they choose what looks right for them. They also get to see what they would look like when the breasts have fully dropped and fluffed and in clothes. You get to see actual results and the surgeon's experience and not a virtual idea of what can be achieved. Women tell me that this process is very helpful in determining what size and style breast implant is right for them. Dr. Ted Eisenberg, Board Certified Plastic Surgeon and Author. RealSelf Distinguished Hall of Fame Inductee. Philadelphia, Pa., USA

First of all take all that you have learned about bwd and throw it away. It is not a good way to judge implant size. I think the sizes you mention are far too large but if you want to look like the photo you sent, it's your decision. The sheer weight of them over the next twenty or thirty years will really cause problems

While your question is a good one, an evaluation in person by a board certified plastic surgeon is necessary to properly determine which implant would be best for you to achieve your desired outcome. It appears that you already have a scar below your breast which suggests you have had prior surgery. The implants you suggested are very large and for the purposes of augmentation (not reconstruction) are highly ill advised. You are likely to encounter significant complications early or late with such large implants, and almost certainly require additional surgery in the future to repair the complications.

I recommend you select a board certified plastic surgeon whose results align with your own sense of aesthetics, and I suggest you seek a pretty and proportionate goal for yourself. Best of luck to you.