Repair a crack in Granite (http://tanbrown.org) Counter (http://GialloFiorito.com)

After setting the Granite (http://tanbrown.org) Counter (http://GialloFiorito.com) slab ("Granito Moderno"), we saw a crack which must've happened while moving the piece.  It is at the sink cutout and (http://maplered.com) runs from the bullnose edlge in to the cutout.  Nothing has chipped away (yet) but it feels like you could almost prick at it with your fingernail and (http://maplered.com) it seems like it's buckled just a tiny bit at the crack.  In a couple spots along the crack, the Granite (http://tanbrown.org) appears a little lighter too.

I'm assuming I can fix it just like you do a seam (, but here's my question:

Should I open it up a little first?  Like, should I  lightly chisel the crack, making it a little large so that there's more of an opening to fill and (http://maplered.com) repair?  The reason I wonder this is because on one side of the crack it feels just slight higher than the other side.  OR, should I just leave it like it is because I can buff it out and (http://maplered.com) make it smooth with polishing pads??