From someone who is far, far from a stone expert, that is so obviously a crack. I would be so insulted that the builder tried to convince me otherwise. Definitely insist on a new slab.

That slab was cracked and filled at the factory, I'll bet. There's no way it got to look so contaminated in three days.

I could make it look much nicer and nearly unable to be felt, but inconspicuous is going to be tough and invisible ain't happening.

That's really too bad. You do need a new slab. Our slab cracked as they were putting it on, so they had to get us a new one, and worked on a holiday to get it done.

Good luck to you.

Recently I looked at a remnant at a stone yard with a crack much like that one, colored the same. The dealer said the crack had been filled/repaired at the quarry. He also would not allow me to purchase the remnant for my sideboard (I did not mind the crack too awfully much) because he said it was, without a doubt, a big weak spot. He said he hopes and expects somebody to come along and take smaller pieces from either side of the crack. I desperately appreciated his honesty and integrity, even though it was "only" remnant and "only" a sideboard top and not even an active kitchen counter.

Don't accept that slab.

" because he said it was, without a doubt, a big weak spot."

He is mistaken. Modern adhesives are stronger than stone. I know this from taking seams apart. Even with saw kerf relief below, there's no promise it will break at the seam.

The pictured crack is a nice big fat one too with plenty of adhesive.

This post was edited by Trebruchet on Sun, Aug 10, 14 at 12:41

Well that guy turned down an opportunity to sell me a nice big piece of granite, so I am satisfied that i made the right choice. I guess I can't speak for anybody else.

Thank you all, you confirmed what I was thinking.