(Bloomberg) Transparency isn't just a buzzword in politics: For a few years now, it’s been a genuine trend in the world of luxury watches. For example, earlier this year, Hublot introduced its Big Bang Unico Sapphire timepiece cut straight from the sapphire—the first time the material had ever been cut on this scale.
And now from Greubel Forsey, maker of what are some of the most supercomplicated timepieces in the world, comes the Double Tourbillon 30° Technique. It's a watch the company's made for a while, but now it's offered in, you guessed it, an all-sapphire case. Greubel Forsey calls it the “pinnacle of transparency,” and it’s easy to see why. No metal is used at all in the creation of the dial and case (save for the winding pin), allowing for a panoptic view of as much of the movement architecture—and its dynamic interactions—as possible.