The Astronomia is the embodiment of 21st century ultra-high-end watchmaking and a globally recognized symbol of Jacob & Co watchmaking expertise. A world-first both in the boldness of its unprecedented concept and its entirely mechanical construction, the Astronomia has gone beyond impressive horological achievements to becoming an outstanding multidisciplinary engineering accomplishment.

At the center of the Astronomia is an unprecedented four-arm movement. Attached to each arm is a novel complication. Two of the complications have earned patents because of their design and engineering. The other two are original works of art that highlight Jacob & Co.'s skilled craftsmanship. When combined, they contribute to a spectacle of moving objects that rotates and floats inside a spectacular sapphire crystal case.

Introduced in 2018, the Astronomia Flawless was named after the unique case made entirely of sapphire crystal. "Flawless" normally refers to the highest grade of diamond clarity. Thus, the name of this watch is a fitting interpretation for the crystal-clear sapphire case of the Astronomia Flawless.

The Astronomia Flawless Multicolor adds to this story by paving the base of the case with 281 multicolored sapphires.

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 rotating magnesium and hand-lacquered globe of the earth, a rotating spherical diamond with 288 facets known as the "Jacob Cut," a patented triple-axis tourbillon, and a time display subdial with a patented timepiece-differential gear system. This entire platform performs a revolution every 20 minutes while each complication moves independently.

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.

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 5 minutes to complete, while the 3rd axis of rotation is made possible by the 20-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.

The Astronomia Flawless Multicolor adds to the story of the Astronomia Flawless by paving the sapphire crystal base of the case with 281 invisibly hand-set multicolored sapphires. The high quality and complimentary colors of the sapphires and the smoothness of the finish are a testament to the gem sourcing and gem setting abilities of Jacob & Co.

The Jacob Cut is the signature cut for the diamonds and gems that appear on all Jacob & Co. Astronomia timepieces. It always marks its presence on one of the arms of the Astronomia vertical movement and at times it graces other parts of its extra-large watches. It is a distinctive work of innovation, creativity and execution.

The spherical, 1-carat, 288-faceted gem is a unique cut exclusive to Jacob & Co.

The Jacob-Cut diamond starts out as a much larger rough, up to twice the size as the finished product. Quality is important, with clarity being the most prized of the four Cs of diamond quality. If there is any sign of an inclusion the diamond must be scrapped.

The rough diamond is first cut by machine into a spherical shape, near the size of the final diamond. Then the master gem cutter does his work, shaping the stone by hand and cutting each of the 288 facets while maintaining its shape. The danger is that the stone will become oblong, losing its round shape. 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) to maintain stability of the movement. One-carat is the standard size, but other sizes have been specified depending on how it is used within the movement.

Another challenge is ensuring the precise dimensions of the facets. If the gem cutter puts slightly too much pressure on the stone while adding the facets, too much of the diamond will be cut away, and the sphere will be too small to use. 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. It rotates at different rates depending on the other elements and the theme of the watch. However, the cut has been applied on colored gemstones and placed in the dial in other ways.

The globe of the earth is made of magnesium coated with hand-painted blue lacquer and completed with rose 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 60 seconds while traveling around the dial every 20 minutes.

The exceptional high watchmaking mechanics and gem-set beauty of the Astronomia Flawless Multicolor 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.

The Astronomia Flawless Multicolor sapphire crystal case measures 50 millimeters in diameter and 25.45 millimetres in height at the highest point of the sapphire crystal dome. This model provides an alternative to the totally clear case with a base paved with 12.57 carats of multicolored sapphires.

The time 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 Jacob & Co. blued hands are hand-finished.

The stunning Astronomia Flawless case made of sapphire crystal

The base of the case is paved with 281 multicolored sapphires totaling 12.57 carats

The iconic Astronomia movement with four satellite arms rotating around the dial in 20 minutes

The patented Astronomia triple-axis tourbillon

One carat 288-facet Jacob Cut diamond and magnesium globe, rotating on themselves in 60 seconds

The time display is always in the right orientation thanks to a patented Differential System