Zenith’s 2025 DEFY Zero G Sapphire comes in two case treatments: deep blue sapphire and transparent sapphire. The brand says both versions share the same 46 mm case dimensions, hand-wound El Primero 8812S movement and gimbal-mounted Gravity Control module; no technical performance difference between the colors is identified.
What differs between the two versions?
The visible distinction is the sapphire case: one is deep blue, the other transparent. Zenith describes the rest of the core technical package as shared. The announcement does not identify a mechanical or performance advantage for either version, so the choice is one of appearance and confirmed availability.
Zenith’s 14 October 2025 announcement presents the models as part of its 160th-anniversary celebration. The brand says the case middle, bezel and back are cut from sapphire blocks, and both watches measure 46 mm. Zenith characterizes sapphire as almost as hard and scratch-resistant as diamond; that comparison is the manufacturer’s description.
Both versions have a lapis lazuli time display and small-seconds display, luminescent faceted hour markers and an openworked view of the movement. Zenith notes that natural variation in the lapis lazuli makes each dial unique. The watches are presented on an integrated blue alligator-leather strap; the technical sheet specifies a rubber lining and titanium folding buckle. Zenith’s announcement and technical information describe the shared package.
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Specialist watch publication Fratello gives the references as 04.9003.8812/51.R584 for the blue model and 04.9000.8812/51.R584 for the transparent model. Zenith’s technical document lists the blue reference as 04.9003.8812/51.R584. Check with Zenith or an authorized retailer for the current catalog reference, particularly for the transparent edition. Fratello’s report includes both reference numbers.
How the Gravity Control module works
The defining feature is not a conventional tourbillon. Zenith says gravity can affect a watch’s rate differently depending on its position. In the Zero G design, a weighted, balanced gimbal-mounted assembly keeps the regulating organ horizontal as the watch moves, rather than keeping the entire movement horizontal. In Zenith’s words: “Here, the regulating organ, not the entire movement, is kept horizontal.”
Zenith contrasts this approach with a tourbillon, which it says compensates for positional errors over time in certain static positions, while Zero G is intended to address positional variation as a wristwatch moves. The company also says torque passes through a conical bevel-gear system and miniature differential to maintain consistent transmission as the module tilts. These are the manufacturer’s explanation and performance claims, not proof that the watch defeats gravity or outperforms another regulating system. No independent accuracy test of these 2025 editions is established here.
Zenith says the module contains 139 components in about 1.3 cm³ and uses nine non-magnetic, lubrication-free ceramic ball bearings. It also says the compact module occupies 30% of its initial volume, associating that refinement with 2018. The brand traces the Zero G concept to 2008; these dates describe the technology’s development, not the launch date of the sapphire editions.
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- Zenith Defy Classic Automatic Skeletal Dial Titanium Men's Watch 95.9000.670/78.M9000
Movement and specifications
Both watches use the skeletonized, hand-wound El Primero 8812S. Zenith’s technical document lists a frequency of 5 Hz, or 36,000 vibrations per hour, a 50-hour power reserve and water resistance of 3 ATM.
| Specification | DEFY Zero G Sapphire, both versions |
|---|---|
| Case | 46 mm; deep blue or transparent sapphire |
| Movement | Hand-wound, skeletonized El Primero 8812S |
| Frequency | 5 Hz (36,000 vibrations per hour), according to Zenith’s 2025 technical document |
| Power reserve | 50 hours, according to Zenith’s 2025 announcement and technical document |
| Water resistance | 3 ATM, according to Zenith’s 2025 technical document |
| Edition size | 10 pieces per version, according to Zenith |
Edition size, price and availability
Zenith says each color is limited to 10 pieces worldwide. The brand’s 2025 technical document lists a price of €220,000. That is a dated manufacturer figure, not a guarantee of today’s local price, tax treatment, or remaining stock. Fratello reported €220,000 / US$207,500 on 24 October 2025, while Oracle Time reported CHF 200,000 on 14 October 2025; these are source-dated figures in different currencies, not current conversions. For current pricing and availability, contact a Zenith boutique or authorized retailer.
Zenith says the watches are available through its physical and online boutiques and authorized retailers worldwide. The announcement appeared on Zenith’s pressroom; additional dated price reporting is available from Fratello and Oracle Time.
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