First mistake was selecting waterfall for shaker cabs and trim not well planned., Get your cabinet installer back for leveling and adjusting, I am betting your floor was not even checked for level

Why is there quartz above the trim

What the #$%%^

You always have a gap, your miter is not great and your lack of overhang is making the lack of quality more noticeable.

Waterfall is meant for a different look. Not even above is great,,,,,,which means just because you can find it on the internet, doesn't mean it is great.

Better below.....

What do you know about the cabinets? I'd suggest small trim under the overhang, finished to match the cabinets. If you know brand/color, that would help.

On the other side, is this correct? I'd try for a filler and not caulk of some type.

Any pictures of the island before the new top?

That happened to me when I had a waterfall installed. My countertops are Black Pearl granite. I definitely had the installer fix the problem. Obviously, the top of the waterfall was cut too long. They cut mine back on site and reinstalled so the vertical slab sits flush against the side of the cabinet. Unfortunately, your miter is pretty sloppy, too. I would not settle for having the gap filled. I will post a picture of mine tomorrow.

IMO those cabinets should never have had a waterfall counter and now I think it is a mess that maybe can be fixed but the fix might be worse than now. This type of counter needs meticulous measuring and obviously that was not done but the fact is the cabinets also needed to be perfectly installed and level and who knows what that was like .

There are a lot of naysayers regarding waterfall counters on this site. I chose mine, not because I wanted the latest and greatest, but because I like the simple, clean look. Nine years later, I am still glad I did. However, it does need to be done well. Here are pictures of the waterfall edge at the end of my peninsula after the fix. Sorry, I don't have any pictures of the 'before.'

@melindas1977 I love the cabinet color! What color is it?

I’ve come to a point with contractors now that when show me shoddy work I trust it…and I run. Bc I trust that it’s only going to get shoddier.

I’m sorry you’re dealing with this bc it’s such a poor installation. There’s no precision Or thoughtfulness of how to do the work well.

And truthfully, there’s too many trades out there like this now.

My personal recommendation is to say this is not acceptable and start getting quotes from other reputable stone folks who will take over. I do think it can be remedied but don’t trust your current contractors with it. You can’t get stone back once cut too far. I think you still have a chance to fix this now.

Good luck!!

Thanks, S M! It's a bit unconventional, but I have thoroughly enjoyed it. It is Behr Green Tea Leaf.

@melindas1977, sorry, but the waterfall looks just awful and wrong on that old, very dated cabinet style. I mean, your cabinets aren’t even full overlay!

Waterfall belongs on contemporary/ modern cabinets, with slab doors and drawers. It looks totally out of place on both yours and the OPs cabinets.

But, hey…if you’re satisfied with it, continue to enjoy the mismatch.

It's hard to say whether the problem originated with the template or the fabrication, but what is really hard to understand, in the OP's case as well as mine, is the acceptance by the installer that all was well. At any rate, I continued to work with the installer, and the situation was remedied without a big to-do. I would encourage the OP not to settle for anything but a recutting and correct realignment of that mitered seam.

@m_robayo, did you get any satisfaction from the stone fabricator or installer?

thanks everyone fir the comments. upon further review, I took some clear readings with a level against the vertical Taj Mahal panel. This confirms that the waterfall leg was installed significantly out of plumb, which directly explains why the gap flares out to a full 1/2 inch at the top.

Therefore, a cosmetic wood trim would not fix the issue. I am in exchanges with the stone fabricator asking for a solution.