Renowned for its incredible work with Tourbillons (escapements that compensate for errors in timekeeping due to the effects of gravity when the watch is in certain positions on the wrist), Greubel Forsey now unveils one of its most beloved movements inside a totally transparent case. Meet the Greubel Forsey transparent Double Tourbillon 30-Degrees Technique Sapphire watch. Created in an incredibly limited edition of just 8 pieces, the watch is a United States exclusive, retailing for more than $1 million each.
The case is machined from a solid block of sapphire — a feat that requires diamond-tipped tools and hundreds of hours of time. The sapphire case allows for a crystal clear view of the complicated 396-part patented double-tourbillon movement. This patented caliber features one tourbillon cage inside the other, each rotating at different speeds (the outer one completes a single rotation once every four minutes; the inner one rotates once every minute). The result is a near perfect chronometry rating. In fact, Greubel Forsey achieved an unheard-of score for this movement of 915 out of 1,000 points at the International Chronometry Competition in 2011.