Parchetto paving unsightly color differences

Well, the OP did write exactly that:

Can says that he should have mixed the rows, like when laying laminate.

but if I mixed it up it would have looked just as ugly. It seems to me that there is indeed a proper gradient over the stones (over several stones), and I think that will have to be maintained.

Stones are practically ready on the pallet, but the rows just needed to be swapped sideways there.

The agreement was to prepare the ground and lay the paving stones.

However, I expect a professional to point out such things. And the paving stones were also known beforehand.

You would probably have been on the safe side if the contract referred to the installation instructions of the manufacturer ([gibts auch im Netz]) and a corresponding mixing of the stones was carried out.

It looks exactly as described: always one layer from one pallet and then one layer from the next pallet...

I wish you a lot of patience, time, and nerves if you want to have this corrected cost-effectively.

Maybe someone will also realize that it is a botched job.

It's a botch... I would be ashamed to deliver such work...

We first spoke with him; he says he doesn’t know how he could have laid it differently. We will first write to Kann's field service again and request an on-site appointment. Especially since we, together with the paver, have noticed that many stones are completely only one color and many have a very strong blue tint. We will definitely not leave it like this. We find that the picture in the brochure has nothing to do with the delivered stones. This is how we imagined it: That has nothing to do with the delivered goods.