# Zenith Defy 21 Ultraviolet Review by A.I. WatchMetrics

## Watch Summary
The Zenith Defy 21 Ultraviolet is a striking limited-edition sports chronograph that fuses avant-garde aesthetics with technical prowess, showcased through its sandblasted Grade 5 titanium case, ultraviolet purple lacquered dial with rhodium-plated indices, and matching ceramic bezel, targeting discerning collectors and modern enthusiasts who crave bold colors and superior performance; its standout El Primero 21 automatic movement delivers a 50-hour power reserve, dual-frequency operation, and a patented 1/100th-second chronograph for unmatched precision.

## Overall Watch Rating: 9.0/10.0

**Movement Metric (9.9/10.0)** - The El Primero 21's extraordinary complexity, high-beat regulation, and exceptional finishing surpass even many haute horlogerie calibers like those in Audemars Piguet chronographs.
**Material Metric (9.4/10.0)** - Grade 5 titanium construction with sapphire crystal and AR coating, plus meticulous sandblasted finishing, rivals the lightweight durability of Richard Mille cases.
**History & Innovation Metric (9.4/10.0)** - Zenith's pioneering El Primero legacy combined with the groundbreaking 1/100th-second chronograph innovation stands tall alongside Omega's Speedmaster milestones.
**Dials & Design Metric (9.2/10.0)** - The vibrant ultraviolet dial, angular lugs, and legible layout deliver fresh, eye-catching appeal akin to limited-edition Hublot designs.
**Brand Metric (8.7/10.0)** - Zenith's prestigious heritage and consistent high-craft output place it solidly with peers like Omega in the luxury echelon.
**Versatility Metric (8.7/10.0)** - This titanium chronograph transitions seamlessly from daily wear to adventurous outings, much like a tuned-up TAG Heuer Carrera.
**Complications Metric (9.0/10.0)** - The advanced chronograph with 1/100th precision offers sophistication comparable to Breitling's elite flyback models.
**Rarity Metric (8.4/10.0)** - Limited to just 50 pieces at this price point, it edges out standard production Rolex models in exclusivity.
**Functions Metric (8.4/10.0)** - Core timekeeping plus ultra-precise chronograph functions provide robust utility on par with Grand Seiko sport watches.

## Total Performance Score (TPS): 8.2

## WM Collector Grade: A

## Performance Insights: Exceptional movement and material quality paired with high rarity deliver standout strengths, positioning this limited Zenith as superior value relative to its implied price equivalent.

## TPS Interpretation: Good Value: The watch overdelivers on innovation and specs for its luxury bracket, appealing to savvy collectors.

## Watch Data
[https://www.zenith-watches.com/dw/image/v2/BFBB_PRD/on/demandware.static/-/Sites-zenith-master-catalog/default/dw5e5b5b5e/97.9300.9004-78.I001_1.jpg?sw=800&sh=800&sm=fit] - [https://www.zenith-watches.com/dw/image/v2/BFBB_PRD/on/demandware.static/-/Sites-zenith-master-catalog/default/dw0a0a0a0a/97.9300.9004-78.I001_5.jpg?sw=800&sh=800&sm=fit] - [] - [Defy 21 UV] - [Zenith] - [Defy 21 Ultraviolet] - [Switzerland] - [https://www.zenith-watches.com/en_us/defy-21-ultraviolet-97.9300.9004-78.i001] - [] - [Mechanical Automatic] - [El Primero 21] - [3] - [Limited edition of 50 pieces with ultraviolet purple accents, high-frequency chronograph in titanium case.] - [44] - [52.5] - [14.7] - [24] - [100] - [50] - [36000] - [Super-LumiNova] - [39] - [Grade 5 Titanium sandblasted] - [Sapphire anti-reflective] - [Ceramic Ultraviolet tachymeter] - [Sapphire transparent] - [Screw-down titanium] - [Rubber titanium bracelet] - [Round] - [Ultraviolet lacquered rhodium markers] - [Yes] - [No] - [No] - [No] - [Yes] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [No] - [Yes] - [No] - [No] - [No] - [Yes] - [Yes] - [Yes] - [No] - [Yes] - [Yes] - [Yes] - [No] - [No] - [No] - [No] - [No] - [8.2] - [A] - [25000];

**A.I. WatchMetrics Review v37.4 Grok 4 Fast. December 19, 2025.**