Would There Be Much Difference in a 425 cc High Profile Silicione Gel Compared to 500 cc?

This difference depends largely on your frame.  In a thin woman, the difference would be quite apparent.  In a broader woman of fuller build, the difference would not be substantial.  If you are petite with a narrow base width, it is best to choose an implant with a narrower base diameter than your breast.  If the implant is too wide, it will augment more laterally than anteriorly.  Try them on in an unpadded bra and see what you think.

Hi there-

In most patients, the difference in implant volumes you describe would be subtle...

I would recommend you communicate your goals for appearance carefully with your surgeon and let him make the call at surgery (once he has an understanding of how the two look inside of you).