CLARUS optical coating architecture
Five functional layers, engineered as one optical system: an easy-clean topcoat and a multilayer dielectric antireflective stack on each face of a synthetic sapphire substrate.
How the coating works
The antireflective stack is designed around optical interference. Reflections generated at different interfaces interact with one another, so a properly designed stack reduces net reflected intensity across a target range of wavelengths and incident angles.
- 01Refractive-index contrast between adjacent films.
- 02Optical thickness of each layer relative to the target wavelength.
- 03Spectral bandwidth across visible light.
- 04Performance across relevant incidence angles.
- 05Film density, adhesion and environmental stability.
- 06Residual reflection color and total transmission.
For a watch crystal, the target is not simply a low reflection value at one wavelength. It is a balance of low visible reflectance, high transmission, minimal distracting color, consistent appearance and durability on the actual sapphire geometry.
CLARUS develops its crystal specifications around the principles of advanced optical thin-film engineering, including multilayer antireflective performance, coating adhesion and surface protection. Specific coating technologies and manufacturing partners are identified by product where applicable.
American Roots.
German Optical Excellence.
Proudly based in the USA. Made with German optics from ZEISS.
CLARUS combines precision sapphire with a proprietary antireflective coating system developed to deliver an exceptional viewing experience. Featuring advanced dual-sided AR technology and German optical expertise from ZEISS, every crystal is designed to minimize distracting reflections and reveal more of the dial beneath.
Optical clarity, engineered at the surface.
Dual-sided antireflective treatment
Advanced multilayer thin-film technology reduces reflections from both sides of the crystal, so more light passes through to the observer.
Premium sapphire substrate
Synthetic single-crystal sapphire delivers exceptional hardness, optical transparency and resistance to everyday surface abrasion.
Precision coating architecture
Carefully controlled thin-film layers, designed around refractive-index contrast, optical thickness and visible-spectrum performance.
Protective surface technology
An easy-clean topcoat reduces the persistence of fingerprints, oils and water spotting.
Neutral residual color
The coating stack is tuned for minimal distracting reflection color, so the dial reads true from every angle.
Lifetime clarity guarantee
CLARUS ETERNAL™ covers the antireflective coating against premature wear, peeling or delamination for the life of the original purchaser.
Trusted Across Timepieces.
Engineered to Swiss-grade tolerances, CLARUS sapphire crystals unite precision fitment with exceptional optical clarity. Designed for collectors, watchmakers, and enthusiasts across a wide range of brands and models, each crystal is specified to preserve the integrity of the timepiece while minimizing distracting reflections.
Flat, with cyclops
Day-Date 40 and 36, Datejust 41 and 36, GMT-Master II, Submariner 41. A 2.5× date magnifier set at 3 o'clock.
Flat, no cyclops
Daytona. One uninterrupted sapphire surface over the chronograph registers.
Multilayer AR, both faces
Engineered thin films on the outer and inner surfaces control reflection at both optical interfaces.
Light transmission
Less light reflected back means more light reaching the dial, and lower residual reflectance at every angle.
A Lifetime Clarity Guarantee
Clarity should never be temporary.
Every CLARUS crystal is engineered to deliver exceptional optical clarity through premium synthetic sapphire and advanced dual-sided antireflective technology. CLARUS ETERNAL™ represents our lifelong commitment to the quality and performance of that technology.
That's the CLARUS standard.
Read moreDesigned to disappear. Built to perform.
The purpose of a crystal is not to attract attention to itself. It is to reveal the craftsmanship beneath it. From the texture of the dial to the finest detail of the hands and indices, CLARUS is built around one principle.
See the watch, not the crystal.