The UR-101 is the smallest, slimmest watch Urwerk makes. At 41mm across and 9.33mm thick, it sits closer to a dress watch than the brand's usual exoskeletal sculptures. Inside it runs a wandering-hours satellite, the same display logic Urwerk has refined since the 103 in 2003: two rotating discs carry the hours, each one travelling a 180-degree minute track from left to right, then dropping below the dial as the next emerges.
The Diamond Sky takes that watch and wraps it in stones.
214 diamonds, 1.63 carats, a steel case
As Monochrome reports, the case, lugs and bezel are set with 214 diamonds totalling 1.63 carats, all D-E-F VVS quality and responsibly sourced. The dial is engraved with a six-petal floret pattern that catches the diamond setting in a deliberate echo, giving the impression of a stone-set sky behind the satellites.
The case is steel, not gold. The choice matters for two reasons. It keeps the watch cooler on the wrist than a fully gold version, and it holds the price at a level where the watch reads as an Urwerk first and a jewellery piece second. A Timely Perspective notes that Urwerk has done diamond-set pieces before, but this is the first to use steel as the base metal in a diamond-paved case.
Calibre UR-1.01V: Vaucher base, in-house module
The movement is the calibre UR-1.01V, an automatic running at 4Hz with a 48-hour reserve. The base is a Vaucher 5401, the same architecture used by independent brands that need a high-quality automatic without building their own production capacity. The wandering-hours module on top is Urwerk's own: an open-worked carousel that rotates the satellite discs through the minute track.
The crown sits at 12 o'clock, with a puller on the back for ease of use, a layout Urwerk has carried since the original UR-101.
Where it lands
Urwerk has positioned the Diamond Sky as a women's-leaning piece. The brand calls it "wandering hours under a sky of diamonds" in its press materials, and the white rubber strap and slim case profile track that audience. The wandering-hours logic remains the same as the men's-coded UR-101 references that came before, so the watch reads as a category extension rather than a different watch.
Pricing is CHF 85,000, around 89,000 euros, excluding taxes. The piece is limited to 25, sold through Urwerk boutiques and authorised retailers.
For a brand whose watches usually look like architectural studies, the Diamond Sky is a softer piece. It says nothing structural that the standard UR-101 didn't already say. What it does is take the brand's slimmest case and prove that the satellite-hours mechanism can sit inside something jewelled without the design tipping into kitsch. Reading the time still requires the same trick of glance and parse. The diamonds just change the lighting.
Sources: Monochrome on the UR-101 Diamond Sky; A Timely Perspective on the steel diamond-set version; Urwerk press release; WatchTime preview.
