Originally Posted by
Euclid440
Well, not really…
Escher’s were/are Thüringen’s that were selected by or for Escher and labeled as such, but a labeled Escher can be exactly the same stone, from the same spot as an unlabeled Thüringen, and some can perform equal to or better than a labeled stone. Some were selected, some not.
It was probably just a marketing gimmick, though Escher stone were probably selected as blemish free. Interestingly some of those “Blemished” stones are most sought after…
Both Thuringen’s and Escher’s were mined in a variety of colors and can, like all natural stones perform uniquely different.
I don’t believe much is known about the ecxact, selection process, as mining pretty much ceased at the end of WW2, and probably had a lot to do with the advent of the Double Edge razor and blade.