Where did you see the picture? Is it possible to find out the designer?

If not, it could be honed white Thassos marble, white Corian, or white quartz. The photo is blurry, so it is difficult to say with any certainty.

It doesn't matter. You will get the look with literally any pure white solid surface, and yes, even Corian!

What is the rest of your bath, all the materials?

The original pic was an Instagram, ( slightly less blurry below ) not Pinterest.

Put all your materials together, and it isn't the bench or the curb top driving your love of the inspiration pic.: ) - it might be a hazy photo?