Greubel Forsey has just unveiled its Double Tourbillon 30° Technique, a luxury watch featuring an all-sapphire, completely transparent face. Heralded as the “pinnacle of transparency,” not a single piece of metal is used in the dial and case which means that wearers can see all of the movement parts and its workings.   The million-dollar watch is created from a one large sapphire crystal.  Sapphire is used in every aspect in the.. Read More