Has the FDA yet approved any implants greater than 800 cc? I was told that one or more manufacturers was seeking permission.

One company (Mentor) is currently performing a clinical trial, but I am not sure when it will be completed and submitted to the FDA for approval. I am unsure whether other companies are performing any at this point.

A more important question to ask, in my opinion, is whether an implant of that size is a "safe" option or not.We know that a progressive increase in implant size is accompanied by a consequent increase in weight. This weight must be supported by the tissues of your breast; more specifically the tissues at the bottom of your breast.Before considering an implant of such a size, you should carefully consider the potential impact on your long term appearance and the current strength of your breast tissue.  If you have been through significant weight change, you've had noticeable breast changes from pregnancy, or are at a more advanced age, you may have a very short-lived pleasing appearance if you use an implant of that size.A Board-Certified Plastic Surgeon would be the best person to advise you on your options.  He or she can examine your breasts and provide you with the best advise for the most pleasing long term result. I'd suggest a consultation before setting your sights on a particular implant volume. Best of luck.