High jewelry watchmaking within Jacob & Co is defined by the transformation of precious stones into structural elements of the timepiece itself. These watches are not simply adorned with diamonds or gemstones; they are built around them. Each stone is selected, cut, and positioned to achieve exact alignment, often using invisible or channel setting techniques that allow surfaces to appear continuous without visible metal separation. This level of craftsmanship requires both gemological expertise and precise engineering to maintain durability while achieving visual perfection.

Collections such as the Billionaire and Caviar Tourbillon demonstrate the full extent of this approach. The Billionaire features hundreds of emerald cut diamonds arranged with absolute uniformity, forming both the case and bracelet as a single cohesive structure. The Caviar Tourbillon introduces color variation through rubies, sapphires, and emeralds, arranged in complex patterns that extend across the entire watch. Beneath this exterior, highly developed mechanical movements continue to operate with precision, ensuring that the watch remains functionally sound while visually extraordinary.

The construction of these pieces involves extensive handwork, where each gemstone must meet strict criteria for clarity, color, and cut. The process of setting alone can take months, as each stone is individually positioned and secured. The result is a category of watches where material, craftsmanship, and mechanical function converge, producing timepieces that exist at the highest level of both jewelry and horology.