^^I was going to say Herringbone marble. Here is a recent thread that is a cautionary tale that if you pick this style of backsplash, make sure you get the exact shades you wanted, AND the size tiles you wanted. The OP in this thread unfortunately did not get what she ordered: https://www.houzz.com/discussions/to-re-do-brand-new-but-unfinished-backsplash-or-live-with-it-dsvw-vd~5681487

According to the people who's kitchen that is, it is this tile from Lowe's

Be VERY careful with Carrera marble from any big box stores. One cannot choose ones tiles - they come by the box and it's not unusual for half or more of a box to be tiles that don't match. And no, they cannot be returned!

I had very good luck with consistent color with my Carrera marble large subway tiles I bought from https://www.carraratiles.com. They were very easy to work with, knew what color their tiles were coming in (white/more gray) and actually assigned them a dye lot number. Mine came in uniformly white and my tile setter said he never had to even look in the boxes and select a "good one" - he just took them out as they came, they were so even. None of that "order 20% more for color matching" nonsense.

I love the herringbone look! Marble is a natural stone and has inconsistent coloring, make sure the boxes come from the same lot. Where I purchased my tiles they allowed me to return anything I did not use as long as they were boxed up. So I bought over the amount I needed, laid all my tile out and only chose the colors that made sense for me.