Mylands. You always regret your economies. I've repainted this kitchen 4X over the years, and last time was in Dulux which wore so poorly. Just custom mixed a new vibrant duck egg to paint my kitchen in marble matt walls, eggshell woodwork, and floor paint. Mylands matched impeccably. It was a dream of coverage, and looks spectacular. The quality of the pigment shows, looks the money, nothing like synthetic mediocre pigments in cheaper paint. It's a big improvement.

Hi they look like they are marble and possibly from Ca Pietra. http://www.capietra.com/shop/stone-walls-floors/jet-set-collection-milan/.  Happy hunting!

That's interesting colourhappy - we did omit the aqua tiles and put just the taupe with blanco (which has some grey tones in the variations) but it looked a little bland which is why we thought the aqua might liven it up but now I'm thinking you are right and they are too cool for the flagstones.

Given the "pattern" of the surface goes all the way through, that'd mean real stone/marble would have to be a full - and possibly thick - slab, milled down and then polished to the fluted surface. The price for that, and the substructure/installation cost for a real stone slab of that size and weight, is going to be in the range of "whatever - don't do it if that matters in any way". I mean, crazier things have been done in London for sure, and you'll find natural stone fabricators willing and capable to execute this. I wouldn't preclude a custom commission but agree with others, it's probably a form of large-format porcelain. Have you considered contacting the developer directly ?