Assuming it was not set to "Internal Storage"...you can put the card in a computer to see if that would read it. If the card was set as "Internal Storage" then the data is gone as it was encrypted and you have no way to decrypt it now that the phone was reset.
Lost if you had the SD card set as internal. Ive done this a few times running different roms and testing. Sucks, but it is one of the bad things about the internal SD card option.