Put a nice white crown mold flush with the top of the cabinets

Our gap wasn't a large as your but hubby thought he would just walk away from it. Nothing I said mattered. Lucky for me I have a bff in a wheel chair. She could see it!! Quarter round was all we needed.

Perhaps a lot of filler is what you need

or this

https://www.youtube.com/watch?v=2UVpEdFY8D8

Why can't the tiles you're using be cut to fit under cabinets? It's the easiest way to complete the project.

Beautiful counter, please share what it is and color name.

@arcy_gw @Mackenzie King I definitely like the quarter round & crown molding idea. Also @eam44 i know it works both ways but two things, remember this is my first time and I also practiced doing it long ways. They didn’t come out to well when I cut the tiles long ways.

@Kath its quartz and the name is brown fantasy

Do you mean quartzite brown fantasy?

I installed the same tile and had the same gap. I cut the tiles down to fit.

Outstanding job for a first time install, very impressed with the inside corner layout. Kudos.

Jadi Astute Construction...”filler”?! NO NO NO! Not professional. That would look crappy. You can’t seriously think that could be acceptable.
Either cut the same tiles to fit or buy matching small tiles to fill the gap.

Rent a wet saw from Home Depot or some other tool rental business in your area.

I think you can find a flat trim piece to fit in that space. I had the same problem and this worked for me.

I have also done subway tiles myself and am not very experienced and had no trouble adjusting the manual tile cutter to cut lengthwise on that same kind of gap. Just try it- you’ll see! Also, tile nippers are inexpensive and can help if for some reason pushing down on the cut tile breaks the thinner side that you need.

If you cut the tiles lengthwise and end up with a jagged top edge, wouldn’t narrow quarter round painted the same color as the tile fill the gap and cover the rough edge?

You are doing really well. It takes some practice getting a smooth cut, but they also make a “rubbing stone” to help you smooth out an imperfect cut. If I were you I’d just practice cutting some of your tiles in half lengthwise, the easier cut, then try it to measurement. Are you planning to install plugmold or under cabinet lighting?

I recently bought an inexpensive Chicago Electric wet saw from Harbor Freight. (I usually buy top of the line, so buying something inexpensive was hard for me.) I bought it for just one project, but have found it very helpful several times over. Just buy the wet saw and be done with it. You'll undoubtedly use it again and again.

rent a wet saw. cut the same white tiles horizontally to fit in the upper space. (put the cut edge up against the cabinet, leaving 1/8"or less for grout or caulking. Mkay?

put a gold striper