@jeandeyoung I realize that this is an older thread but I recently had an issue with poor fabrication of our marble countertops in kitchen. I was shocked that they would place a seam over the dishwasher and continue with another one without 3 feet left of there. Furthermore, the seams were about 1/4" thick which were repaired with white epoxy and then the repairer cracked the edge and tried to hide it. Furthermore, both the radius at sink and cooktop were bad. I brought it to my GC's attention and he blew me off immediately. It took me three weeks to get up the nerve to finally say that the job was unacceptable for $10K; I was going to replace a portion, then finally had another fabricator after inspection take them out because the entire job could not be "pieced" nor "matched" color-wise. As it turns out my contractor's sub of 16 yrs actually subbed out the job to someone else because he was too busy. No contracts were ever signed and the fabricator only came out once to measure and was not here at install nor did he come back and inspect after I complained. My contractor left for five weeks because he was furious - mainly due to the fact that I busted "them" for poor work. I don't want perfect - I just want a decent and fair job in the first place. This has delayed our project for almost three months because now it's back to the drawing board to select a countertop surface. Not easy doing it at the end of a project vs. selecting first where everything revolves around that top! Fortunately, my plumbing has never been installed. I hope you eventually got your issue resolved amicably but what a stressful situation for all involved.

I am a fabricator. Truth is sometimes stone breaks in the fab shop. A weak spot in the stone near a corner can result in a broken corner even tho the fabricator did nothing wrong. A competent shop can usually fix it so the homeowner never knows it was repaired. They should be able to fix it so no one except you would ever notice.

Oiled stone? That makes no sense. Soapstone is generally the only stone to ever be oiled. A good quality fix of a fissure or a crack is undetectable. It will be stronger than the surrounding stone. Quarries repair stones all the time and send them along to slab yards and no one is the wiser. A well repaired crack is acceptable, and even to be expected in some stones. Some stones are just prone to cracking. Thats not a well repaired crack. They should strive to do better. But, because you stopped payment, they might not. You set yourself up as an adversary first thing, rather than a reasonable customer who just wants things corrected. Stopping payment was very uncool. If you’ve vetted your fabricator on the front end to be reputable, you just spit in his face, and virtually called him a crook. That's totally not the right way to handle that.

I just noticed the crack spans a cooktop cutout. If so, it could be a blown reinforcement rod. Look up under the overhang please. You may see a line about 1/4" thick filled with resin. If so your top is rodded. Just because you don't see the line doesn't mean the top isn't rodded; you may have to pop off the cabinet front to see. Ask your fabricator if he rodded the top.