How to fix a 3 inch crack

As my father in law and (http://maplered.com) I were attempting to intall a slab of Granite (http://tanbrown.org) , specifically around the undermount sink, it suddenly cracked right by the thin area of the sink.  Its about a 3-4 inch long crack.  Starting from the inside of the sink area out to the bullnose.  We installed the Granite (http://tanbrown.org) and (http://maplered.com) manage to put back the 2 pieces together and (http://maplered.com) it formed together nicely, but the crack shows and (http://maplered.com) I would like to fill it and (http://maplered.com) just make it dissapear.  It looks absolutely hideous.

what can i use to fill in the crack and (http://maplered.com) color match it back to the Granite (http://tanbrown.org) ?