Well. You are talking about a no seam slab , SLICED to halves to make stair rise and turns. A great seam? Of course possible...! But the GREATEST seam of all time is still not completely invisible. That is simply fact. It applies on any quartz, granite, quartzite, any solid surface.

The "warnings" you mention, apply to veining match, particularly when used in a kitchen perimeter with a 90 degree turn. Veining match can in NO way be guaranteed.

If you think perfectly aligned veining with a seam will bug you? We can't answer that.

You have other options, but we don't know enough about the kitchen, other than the island is 86 inches long. We don't know the layout. We don't know if you have a SINK on the island, which would lessen the look of a seam. We don't know cabinets, or the look you are after.

Options?

Use a Corian/plain everywhere. ( invisible seams, easier fabrication ) Put the focus on a backsplash. Create a wood topped island.....

We can't suggest without more information.

We don't even know your windows. I can tell you how many of these come up the side of a building via lift, especially in Florida.KACHING$$$

My layout doesn't really matter at all for the question. It is a basic condo. Kitchen petimeter is straight across back wall from patio windows to other side of the room. Island is in front of perimeter and has a sink. The seam will not be in middle of island but off to the side.

I will not be going with any plain option for the island. The entire reason I even decided to swap out the ugly brown laminate the builders put in and spend thousands on fabulous quartz design is to have a statement kitchen that I can enjoy. My backsplash is only a small 18" high part in a small section of the perimeter. My choice for island and backsplash is to be a wow factor...otherwise I'll keep the laminate :-)

The balcony is not an option. I will speak with the fabricator about the seam and ask how disjointed it would be.

Designer Consortium, that makes sense that the width of the sawblade would be lost. I had originally hated the thought of a seam without even knowing the reseal would cause veining to be off. I went for a second quote from a different company in hopes they wouldn't cut the island due to weight carrying up all the stairs. They are $4k more for the job AND said they might charge more to get it up my stairs but cant say until they come out to measure :-( Figure the original co with the seam has great reviews too so might as well go with the beast that I know instead of hopeful thinking.

You're not getting a Brittanica seam much nicer than that.

Joseph, I'm surprised by the placement as I was told by a quartz supplier that the sink area is an unstable placement for a seam. That being said, that seam is quite noticeable. Ive asked to speak with the fabricator who is hands on doing this work about his thoughts. Almost understand why some people choose to place a purposeful borderline in say metal or wood at the seam to make it look like part of the design.

At the sink placement MINIMIZES the seam length by quite a bit. It is NOT unsafe, or unstable.

The length is 86,,,,,, what is width? Is the sink centered? I'd say that will be MUCH less noticeable, and yes....its done quite often, including on perimeter location, both sink and cook tops.

I have never had an issue.

You'll have to pick your poison. Or spend more after a look see by the other fabricator.

I would not do an off to the side seam....

Jan Moyer, island is about 38" wide. Sink is not quite center. Current placement is about 25" from right and 30" from left. Left 30" has the dishwasher below. I will speak to the fabricator installer and ask why they suggested over the dishwasher. It wasnt them that mentioned about the sink seam but at a different place that dealt in stones. They said due to the seam only being interupted by the sink it wasn't as solid.  

I'm going to drive the fabricator crazy with all these questions. Not to mention the gazillion quotes Ive gotten over past 4-5 months on quartz as my mind changed and budget kept increasing because I wanted something more fabulous. But hopefully they understand this is a completely new experience and a huge expense.

Take a look at the colorways of Cambria that allow for bookmatching. It looks like Brittanica is one of them. You could, theoretically, bookmatch the counter at the centerpoint of the cabinet run. Then the seam would be at the center and it would be barely noticeable. https://www.cambriausa.com/bookmatch/#!/

Cut an 86" x 38" piece of cardboard and see if you can get it up the stairs without bending it please.