Hi, they look like Little Diamond tiles from the Dwell collection by Heath Ceramics based in San Francisco. I know because I saw a picture of them and loved them and hunted them down! I even got them to quote for shipping to the UK but the cost was prohibitive for us sadly. If you're in the UK and find anything comparable, please let me know!

Hi, Tiles, paint, glass splashback or using the same worktop effect as a splashback all depends on personal choice as this is the space you will be using and seeing daily especially if you are a real foodie. If it is tiles you are wanting, I wouldnt tile to the top, I think it may be too much Especially with metro tiles; rather I'd prefer to line the tiles with the window bars and see if the extractor can be lowered by a notch to ensure there is continuing straight line through out. Alternatively, I'd consider a neutral coloured glass splashback behind the counter space which would co-ordinate with your walls and work surface.... Good Luck

The tops tiles busca is very similar to ones by Original Style which can be seen in stores like Leekes. Obviously there is a VAST price difference, but if you are looking at one, you should see the other too. I was considering these but went for industrial gold by British Ceramic Tile in the end

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 ?