Watch Glossary
1356 horological terms explained · 2/4
Ceramic-based protective coating used on watch components for enhanced durability and corrosion resistance
Ceramic insert bezel technology providing superior scratch and fade resistance.
Hard, scratch-resistant material used for bezels, case inserts, and dial elements
Highly scratch-resistant bezel insert made from advanced ceramic materials for durability.
Watch bracelet made from ceramic, hypoallergenic, scratch-resistant, lightweight
High-tech ceramic material used for watch cases, providing scratch resistance and thermal stability.
Durable scratch-resistant material inlaid in rotating bezel
Watches pushed to extreme depths beyond normal certification limits.
Precisely beveled watch attachment points for refined appearance
Cutting beveled edges on components to eliminate sharp corners and improve aesthetics.
Decoration technique where designs are engraved and filled with enamel or contrasting materials.
Enameling technique where design areas are recessed into metal then filled with colored enamel.
Separate ring containing hour markers applied to dial surface
Duration of light exposure required for photoluminescent materials to achieve maximum brightness
Metal surface finishing technique creating texture for non-reflective gem settings.
Precisely engineered cavity in watch case receiving gem-set mounting cup.
Creating repetitive diamond or square grid pattern on watch surfaces for tactile texture.
Rolex's proprietary luminous material providing blue glow and superior visibility in darkness.
Hard chrome coating process providing extreme hardness and mirror-like reflective finish.
Rolex's escapement system improving efficiency and precision in watches
Rolex innovation, improved efficiency over standard escapement, reduces friction and wear
Complication allowing precise measurement of elapsed time with start, stop, and reset functions via pushers.
Chronograph feature allowing single-button reset while running, then immediate restart.
Integrated stopwatch mechanism allowing precise timing of elapsed intervals independently.
Multiple chronograph hands pivoting from center of dial for simultaneous event timing.
Integrated or modular addition to base movement for stopwatch function, 7750, 8900 examples
Chronograph operated by a single button controlling start, stop, and reset functions sequentially.
Mechanical movement with integrated stopwatch function including start, stop, and reset buttons.
Complete servicing of chronograph movement and pusher mechanisms
Chronograph hand drift during timing; normal in vintage mechanical watches.
Traditional chronograph with individual pushers for start, stop, and reset for maximum control.
Chronograph with separate pushers for start/stop and reset functions for easier operation.
High-precision movement certified to meet strict accuracy standards, typically -4/+6 seconds.
Official certification verifying movement accuracy within specific daily rate tolerances.
Precision escapement design using detent mechanism for improved accuracy and lower friction.
High-precision movement meeting COSC standards with chronometer certification, achieving ±-4/+6 seconds accuracy.
Measurement of how accurately a chronometer maintains timekeeping over extended periods
Official COSC certification grade indicating movement precision within specific tolerances
Set of rigorous testing criteria ensuring exceptional timekeeping precision.
Testing of movement rate accuracy to verify chronometer certification standards
Degree to which watch maintains precise and consistent timekeeping.
Standard of accuracy required for movements to be officially certified as chronometer-quality
Concentric circular pattern applied to surface through abrasive finishing
Spring-loaded component that engages the ratchet wheel to prevent backward mainspring rotation.
Enameling technique using thin metal walls to contain and separate colored enamel sections.
The specific tool trajectory used to create burnished pyramids in clous de Paris motif.
Finishing technique polishing raised dot edges while preserving textured surface.
Regular pattern of punched dots creating a raised nail-head texture on dial surfaces.
The sharpness of specular light reflection peaks on clous de Paris pyramids.
Positioning system for punch tool ensuring regular spacing of nail-head dots across dial.
The recessed spacing surface between adjacent clous de Paris pyramid elements.
The keenness of peak points in clous de Paris pyramid relief structures.
Three-dimensional variation of clous pattern with enhanced raised dots for shadow depth.
Measurement of pyramid height variation in clous de Paris guilloché patterns.
Multiple small gemstones grouped together creating unified visual element.
Wheel that couples or decouples train wheels during winding versus timekeeping modes
Modern escapement with concentric design reducing friction and improving chronometer performance.
Co-axial mechanism reducing friction between escapement components for improved accuracy
Spiral-shaped component in the mainspring barrel
Single-sided metal bridge that supports one end of a pivot; commonly used for balance wheel.