Astronomia Flawless Diamond

EXCLUSIVE ASTRONOMIA CALIBER

The groundbreaking Astronomia four-arm vertical movement has proven to be a creative and technical watchmaking achievement. Each arm has a unique complication exclusive to Jacob & Co.: A magnesium and hand-lacquered globe of the earth, a spherical-shaped diamond with 288 facets known as the “Jacob-Cut,” a patented triple-axis tourbillon, and a subdial for the hours and minutes with a patented timepiece-differential gear system.

Each pair of opposing arms are perfectly calculated counterweights of one another – a testament to peerless materials engineering and watch movement design. Any variation of the weight would cause the movement to malfunction. Instead, this high complication and all its moving parts run effortlessly for all to see.

AT A GLANCE

• The stunning Astronomia Flawless case is completely made of sapphire crystal
• A spectacular 2.88 carat diamond on top of the Astronomia movement
• The famous Astronomia movement with four satellite arms rotating around the dial in 10 minutes
• One carat 288-facet Jacob-cut diamond and magnesium globe, rotating on themselves in 30 seconds
• Time display always in the right orientation thanks to a patented Differential System

TRIPLE-AXIS TOURBILLON

The tourbillon was originally invented to provide improved timekeeping performance for a pocket watch. The Astronomia Tourbillon brings this 200-plus-year-old complication to breathtaking levels of modern refinement and complexity.

The triple-axis tourbillon of the Astronomia Tourbillon is at the forefront of modern watchmaking. The delicately decorated cage encapsulates the balance wheel, hairspring, escape wheel and several other important components. Characterized by this openworked cage, this outstanding tourbillon rotates on three axes simultaneously. It is a constellation of superbly finished components that, when expertly assembled and fine-tuned, allows the Astronomia caliber to keep accurate time throughout its 60-hour power reserve.

A full rotation on the 1st axis takes exactly 60 seconds, as a nod towards the traditional single-axis tourbillon. The 2nd axis of rotation requires 2.5 minutes to complete, while the 3rd axis of rotation is made possible by the 10-minute, four-arm rotating platform of the Astronomia movement. This makes for a bold new way at how tourbillons can function, when engineered with cutting-edge, ultra-modern technologies and timeless horological heritage in mind.

DIAMOND

The Astronomia Flawless Diamond places a white diamond on top of the Astronomia movement.

THE JACOB-CUT DIAMOND

The Jacob Cut is a unique spherical gem exclusive to Jacob & Co. It is a distinctive work of innovation, creativity, and execution.

The Jacob Cut diamond starts out as a much larger rough diamond, up to twice the size as the finished product. The rough is first cut by machine into a spherical shape, near the size of the final diamond. Then the master gem cutter shapes the 288 facets. To be used in the Astronomia Collection, the Jacob Cut diamond must be completely round and weigh exactly as much as the other three satellites (time display, triple-axis tourbillon, magnesium globe). Another challenge is ensuring the precise dimensions of the facets, which is why the cutting process takes at least two weeks of dedicated, painstaking work.

The Jacob-Cut is most recognizable on the Astronomia watch as a diamond that extends from one of the four arms of the vertical Astronomia movement. However, the cut has been applied on colored gemstones and placed in the dial in other ways.

THE MAGNESIUM GLOBE

The globe of the earth is made of magnesium coated with hand-painted blue lacquer and completed with white gold continents. It is done in a way that ensures consistency in weight, as all four satellites must weigh exactly the same. The globe rotates every 30 seconds while traveling around the dial every 10 minutes.

THE CASE

All of this complicated high watchmaking is visible thanks to the iconic Astronomia Flawless sapphire crystal case, a triumph of engineering and sapphire crystal finishing expertise. The domed sapphire crystal top and curved sides are all polished by hand, treated with an anti-reflective coating, to make sure the artistry is crystal clear.

DIAL & HANDS

Thetime display sub-dial of the Astronomia is driven through a differential system that allows it to always remain level and legible as it rotates with the movement’s four-arm platform across the front of the Astronomia. The Roman numerals on the skeletonized dial are hand-engraved and filled with black lacquer, while the hand-finished hands appear in gun blue metallic.