IN the course of some work on lapis lazuli, we were astonished to find how wide was the discrepancy between the specific gravities of our specimens and the values accorded to this rock by all the ...
One of the hottest trends this year has been the use of stone dials. We saw an uptick in these exotic dials last year among luxury brands, with Rolex, Audemars Piguet and Girard-Perregaux all getting ...