I think it is accurately graded at 63. I think cracking it and sending it in will cost you unnecessary money, and will loose the cool slab. You may get a 64 (which isn't really worth it), you *will not* get 65 out of that. Trust me, if there was any chance of a 65, it would have been cracked already. If you really think it is strong for the grade, I agree with those saying send it to CAC.