Musician DJ Khaled spotted wearing a Jacob & Co

DJ Khaled has never been subtle about his relationship with haute horology, but the Jacob & Co Astronomia Tourbillon in invisibly set baguette diamonds — Reference AT800 — represents a statement that even he rarely gets to make. Limited to just 8 examples worldwide, this is one of the most technically extreme and visually confrontational wristwatches in contemporary production.

The Astronomia Tourbillon AT800 is built around Jacob & Co's patented Astronomia movement, Calibre JCAM09. The four-arm rotating carousel — the defining architectural feature of the entire Astronomia line — completes one full revolution every 10 minutes, carrying four distinct complications at its tips: a flying tourbillon beating at 21,600 vph, a spherical triple-axis differential that corrects timekeeping, a 1-carat white diamond ball that functions as a seconds indicator, and a Jacob-cut rotating diamond. The movement runs for 60 hours on a single barrel. Telling the time, it should be noted, requires a moment of concentration — which is entirely the point.

What separates the AT800 from the standard Astronomia Tourbillon is the invisible setting technique applied across the entire 18KT white gold case. All 342 baguette diamonds are set stone-to-stone, with their girdles locked into hidden rails machined into the gold substrate — no metal is visible between stones at the surface. The technique is extraordinarily labor-intensive, and at this scale, on a case of this three-dimensional complexity, it pushes gem-setting craft to its practical limit. The sapphire crystal dome, which showcases the carousel from every angle, survives the process entirely untouched — the movement remains fully visible, which is the whole premise of the watch.

DJ Khaled has worn Jacob & Co extensively and publicly for years, making him arguably the brand's most effective ambassador outside of formal endorsement. His appetite for the Astronomia specifically aligns with the watch's core audience: collectors who want mechanical credibility wrapped in unambiguous visual impact. The Astronomia Tourbillon satisfies both demands without compromise.

At a UK list price of £775,000 — approximately $975,000 at prevailing rates — the AT800 invisibly set sits at the apex of Jacob & Co's commercial catalogue. With only 8 pieces allocated globally, grey-market data is essentially nonexistent; individual sales, when they occur, are private. This is a watch that does not need a secondary market to validate itself.