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Glossary

Chromalight

A plain-language definition of Chromalight — what it is and why it matters on a Rolex.

Chromalight is Rolex's luminescent material, used on dial markers and hands since around 2008. Unlike the green glow of standard Super-LumiNova, Chromalight glows blue and stays legible for roughly eight hours — about twice as long — making it especially useful underwater and at night.

The blue glow

Most watches use a green-emitting luminescent compound. Rolex's Chromalight emits a distinctive blue and, importantly, holds its brightness far longer into the night. In daylight the lume plots appear white; in the dark they read blue.

For a dive watch in particular, longer-lasting legibility is a genuine functional advantage on extended dives, and the blue glow has become a subtle way to date a modern Rolex (older watches used green-glowing tritium or LumiNova).

Chromalight FAQ

Chromalight, answered.

What is Chromalight?

Chromalight is Rolex's luminescent material, used since about 2008. It glows blue rather than green and stays legible roughly twice as long — about eight hours.

Why does a modern Rolex glow blue?

Because it uses Chromalight, which emits blue light. Older Rolexes used green-glowing tritium or Super-LumiNova, so the blue glow signals a more recent watch.