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An onyx watch dial is made wholly or partly from onyx, a natural stone that watchmakers cut and polish for use as a dial surface. Its appeal is the depth and reflectivity of the stone, but each piece can look different, and the construction depends on the particular watch. If you own one, follow the care guidance for that model rather than assuming stone can be cleaned or polished like a conventional dial.
What onyx means as a dial material
Onyx is a natural stone used in some watch dials. Pequignet describes the stone in its Attitude Onyx as black, opaque, fine-grained, and part of the chalcedony family. That is the maker’s description of its dial material, not a complete mineralogical definition.
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Because the stone forms naturally, its appearance can vary. Rolex explains that its stone dial sections are selected for their lines and patterns, and that natural formation creates irregularities. Differences between two dials are therefore not, by themselves, evidence of a defect. That does not mean every onyx dial will show obvious bands or the same characteristic pattern.
How the surface looks
Black onyx can be polished to a highly reflective finish. Fears describes the dial of its Redcliff 39.5 Onyx as mirror-like. The effect is specific to that model and finish; a product description for one watch should not be treated as a universal specification for all onyx dials.
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A reflective surface can give a dial a smooth, dark appearance, while also affecting how it catches light. When comparing watches, look at the maker’s description and images of the exact model, and consider whether the indices and other dial details remain easy for you to read in the conditions where you wear it.
How makers prepare thin stone dials
Stone must be processed carefully to become a thin dial component. Girard-Perregaux’s account of its Infinity onyx dials describes selecting stone plates, cutting and thinning them, then cleaning and polishing the pieces. The company says its plates begin at about 4 mm thick and are reduced to 0.4 mm, with at least 15 operations required. These figures describe Girard-Perregaux’s process; they are not an industry-wide standard.
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Construction also varies by model. Fears says the onyx disc in its Redcliff 39.5 Onyx is adhered to a brass backplate. Do not assume another maker uses the same backing or assembly method unless its own product information says so.
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What to check when comparing onyx-dial watches
Compare the documented details of the models you are considering rather than treating “onyx dial” as a complete specification. Useful points include:
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- 3 hand basic
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- Case Diameter: 40mm. When the screw lock is released, the crown pops out a little and stops in the normal position
- Water resistant to 50m (165ft: in general, suitable for short periods of recreational swimming, but not diving or snorkeling
- Material and construction: Confirm whether the maker identifies the dial as onyx and whether it explains the backing or other layers.
- Finish: Check whether the surface is described as polished, mirror-like, or otherwise finished.
- Natural variation: See how the maker describes differences in the stone and, where possible, inspect images of the specific watch.
- Legibility: Consider the contrast between the stone and the hands, markers, or other dial details.
- Watch specifications: Compare dimensions, water resistance, warranty, and care instructions using the exact model’s documentation. Do not transfer one model’s specifications to another.
How to care for an onyx dial
The official maker pages cited here do not set out a universal cleaning routine for onyx dials. Before using any liquid, polishing compound, abrasive, or tool on the dial, consult the manual for your exact watch or ask its manufacturer or an authorized watchmaker. Guidance for a particular model is more reliable than a general rule applied to every stone dial.
The available maker descriptions do not establish a consistent hardness or scratch-resistance rating for onyx dials. Avoid assuming the stone is unbreakable or that a polished surface can safely be refinished at home.
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- Bulova's Men's Modern Collection features the best in geometric silhouettes and cutting-edge design.
- 3 Hand, Calendar
- Black Ion Plated Stainless Steel
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Examples from watchmakers
- Girard-Perregaux Infinity: The brand describes black onyx dials and details its selection, thinning, cleaning, and polishing process in “The story of Onyx.”
- Rolex natural stone dials: Rolex discusses how stone sections are selected for their lines and patterns, and notes that natural formation produces irregularity in “Natural stone dials.”
- Fears Redcliff 39.5 Onyx: Fears describes its mirror-like black onyx disc and brass backplate on the model page.
- Pequignet Attitude Onyx: Pequignet identifies the watch’s black onyx dial and provides model-specific details on its product page.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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