Well, that was certainly....odd for her to hear, hearing that Duke wasn't even worried about his cutie mark, well, that was, until a smirk appeared across Diamond Tiara's face "Well, of course it'll appear whenever it does....that is, if it does in the end, I mean, you wouldn't want to have a blank flank forever, now would you?"
Her eyes gazed to Hikari again, ignoring the whole "book" question she was asked at the moment as she glanced back to Duke yet again.