Hublot Spirit of Big Bang Sapphire

About this reference

The Hublot Spirit of Big Bang Sapphire (reference 641.JX.0120.RT) was introduced in 2017 as a limited edition of 250 pieces and is no longer in active production. Collectors prioritize this reference for its tonneau-shaped case constructed entirely from polished synthetic sapphire crystal, a material noted for its extreme hardness and transparency. It houses the HUB4700 caliber, an automatic skeletonized chronograph movement based on the high-frequency Zenith El Primero, operating at 36,000 vibrations per hour with a 50-hour power reserve. The dial features a clear resin composition with rhodium-plated indices and hands. On the secondary market, this model typically trades between $45,000 and $65,000 depending on condition and completeness. A notable production detail is the use of titanium H-shaped screws to secure the sapphire plates, ensuring structural integrity despite the brittle nature of the primary case material.