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The Zenith Chronomaster Sport Rainbow is the 41 mm white-gold, gem-set version of the Chronomaster Sport, reference 45.3104.3600/21.M3100. Announced on January 21, 2025, it pairs rainbow sapphire markers with a bezel set with baguette sapphires and diamonds, and uses the El Primero 3600 automatic chronograph to display tenths of a second.
What is the Chronomaster Sport Rainbow?
Zenith announced this specific configuration on January 21, 2025. Its black lacquer dial retains the model’s overlapping tricolour counters, while rainbow-coloured sapphires serve as the hour markers and baguette stones line the bezel. The case and integrated bracelet are 18-carat white gold.
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The reference is 45.3104.3600/21.M3100. The combination of white gold, coloured sapphires and diamonds distinguishes this gem-set edition from a standard Chronomaster Sport; it is not simply a dial colour variation.
How are the stones set?
Zenith specifies 50 baguette-cut stones on the bezel: 40 sapphires weighing approximately 3.9 carats and 10 diamonds weighing approximately 1 carat. Separately, the dial has 12 baguette sapphire indices weighing 0.46 carats. The stated total gem-setting is 5.36 carats, which includes more than the bezel stones alone.
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Case, dial and everyday specifications
| Specification | Chronomaster Sport Rainbow |
|---|---|
| Case | 41 mm, 18-carat white gold |
| Bracelet | Integrated brushed and polished three-link 18-carat white-gold bracelet; safety double-folding clasp |
| Dial | Black lacquer; overlapping tricolour counters; 12 baguette sapphire indices |
| Hands | Faceted hour and minute hands with Super-LumiNova |
| Water resistance | 10 ATM |
The dial layout includes small seconds at 9 o’clock, a 60-second counter at 3, a 60-minute counter at 6, and a date display at 4:30. The hands’ luminous material provides a practical contrast to the decorative stones, though the rainbow setting remains the defining visual feature.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does the El Primero 3600 show tenths of a second?
The automatic El Primero 3600 is a column-wheel chronograph running at 5 Hz, or 36,000 vibrations per hour. When the chronograph is running, its central seconds hand completes one full rotation around the dial every 10 seconds. The scale can therefore indicate tenths of a second; this is distinct from a conventional chronograph hand that takes a minute to make a rotation.
Zenith’s January 21, 2025 announcement describes the display as follows: “Operating at high frequency (5 Hz or 36,000 vph), it has the ability to display 1/10th of second with unprecedented readability as the chronograph second hands makes a complete dial rotation in just 10 seconds.” The stated power reserve is approximately 60 hours, and the movement includes a stop-seconds mechanism.
What price did Zenith list, and where was it available?
Zenith’s 2025 technical sheet lists a price of USD 112,100. The January 2025 announcement said the watch was available exclusively through Zenith’s physical and online boutiques worldwide. These are dated manufacturer statements, not confirmation of today’s price, local pricing, or current inventory; the cited materials do not establish live availability by region.
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Official sources
- Zenith international product page for the reference and key case and movement details.
- Zenith’s January 21, 2025 announcement and technical sheet for the gem-setting breakdown, specifications, dated price and boutique availability.
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.
