The variety in stone-dials is amazing and the characteristic mineralized stones make such dials a piece-unique. Something that can be rarely achieved with normal "mass-produced" standard-dials. And they are probably a hot thing on next weeks Watches-and-Wonders, Geneva -- for a good reason.
And you know who pushed stone-dials? Piaget since the 1960s. Since they made things right and in their manufacture. Not outsourced to 3rd parties. The best, 2nd to none.