Some photos.

I'm sure you paid a pretty penny for those counters. If you are not happy with it, don't accept it. Have you discussed your options with them?

That island slab is about $2500.

Aesthetically, i don't think the crack will be noticeable once the cooktop is in. However my concern is durability. If someone puts their palms on that thin area in front of the cooktop and leans forward, will that crack it or the other side? I don't have a concept of strength for a thin section like this.

I am a fabricator. Your options on the cracked cooktop rail are to require a replacement or accept a repair and a discount. Once the cooktop is in place there will be very little of the crack showing and a good repair will make it very hard to see. Re: the damaged edge; insist on a fix. They can do a better job back in the shop so that would be my choice. Note if the cooktop is in the island they should just make a new island. good luck.

The epoxy injected fissure will be stronger than the rest of the stone. It’s going to be fine. This type of stone often has fissures. That’s part of how you know it’s Mother Nature made.

Give them a chance to buff out that edge. If they can, it’s fine too. If they can’t, that’s a new top. Deep breath.

Nothing is ever perfect with people involved. But, that can be better, and it may not need to be replaced. If it does, that’s fine too.

So if they manage to buff out the edge and he gives me guarantee in writing about the cooktop rail crack, do i ask for some sort of discount?

How do you know if it's a fissure vs. a crack from when they were cutting it?

Cracks can occur at fissures. And fissures can exist on their own, without cracking. That’s a normal part of stone. Repair of any of that, crack or fissure, is never an issue, unless they lack blending skills.

But looking at your pictures a second time, the cooktop cutout has a sharp 90 inside corner. That is prohibited in all stone manufacturing. All inside corners should be radiused, to avoid stressing the stone. That sharp 90 is what caused that to crack. Reinforcement of epoxy will just shift the stress elsewhere. That will crack again, just in a slightly different adjacent spot.

They should redo that.

https://www.naturalstoneinstitute.org/default/assets/File/consumers/homeownersconsumer_countertop.pdf

I'm betting the cabinets aren't flat. The cooktop cutout was under stress from un-level cabinets and when they finished the cutout, it snapped. I'd never make a 90* corner, especially for a heat generating appliance cutout.

If they can make their crack look as good as this, I'd give them a pass:

Oh my --- what helpful and knowledgeable advice on this thread. Keep us posted. fingers crossed for things to work out to your liking.

It was cracked/fissured before they even laid it on the cabinets. They left the cooktop piece in place and finished cutting it out once the top was all installed.

Kinda leaning towards being ok with it as long as they givens a guarantee in writing for as long as I live in the home to take care of it if anything happens to it. Need to figure the best terminology to cover me for any scenario .

Well i'm still trying to get a resolution with the company on this (they've yet to be paid). Right now the written "warranty" is all he is offering. At this point if i say i want the slab replaced, they'll likely have to redo everything in order for it all to match because i doubt they will get a new slab from the same lot.

Sounds like everyone is saying the warranty is useless....so how much of a discount is fair?

I don't know what the markup/margin is on this sort of thing to be fair for the both of us.

(I am not a pro )--- I think the reason it has been suggested that the warranty is meaningless ( or might be) is that for starters, you might or might not be able to enforce it if they decide not to honor it . If they won't stand by their word, good luck. More importantly though, what resonates to me, is that even if they are entirely reputable and honorable, in this day and age, who knows what businesses will survive. The economy is really being tested big time.