I am a 34C. Will 300cc silicone implants bring me up to a D cup?

I would say simply that if you are a true 34C a 300 cc implant should take you up to a nice D cup. Maybe a DD in some bra manufacturers. I don't guaranty cup sizes as they vary for bra to bra but try on the 300cc implant in a 34D bra and see if that fits for you or a soft bra and see if you like the size by looking at yourself in a mirror.

Thank you for your question.  It is difficult to say exactly what cup size would a 300 cc implant would make you.  There are many variations between manufacture's cup sizes.   Additionally, women have different anatomical dimensions such as breast base diameter, breast volumes and chest wall dimensions.  I always have  women try to focus on the look they desire rather than the cup size.  By having them bring in pictures, trying on special sizer implants in the office, taking measurements in the office and using sizer implants in surgery to fine tune the look they desire, they achieve the size, look and inevitably the cup size.  I usually find the actual cup size they eventually  go into is a little bigger than they initially asked for, but it is the look they wanted.  Have a good open conversation with your plastic surgeon to guide you in your implant selection.