Grand Feu enamel is a prestigious and traditional technique used in watchmaking to create exquisite and durable dials. The term "Grand Feu" translates to "great fire" in French, reflecting the high-temperature process involved in its creation. This technique involves applying multiple layers of finely ground glass powder onto a metal surface, typically copper or gold, and then firing it in a kiln at temperatures exceeding 800°C (1472°F). Each layer is meticulously applied and fired separately, allowing for the creation of vibrant colors and intricate designs.

The Grand Feu enamel process is renowned for its complexity and the skill required, as even the slightest imperfection can lead to the entire piece being ruined. The result, however, is a dial with a unique depth and luster that is resistant to fading and aging, maintaining its beauty over time. This technique is often reserved for high-end and luxury watches, as it adds a level of artistry and craftsmanship that is highly valued by collectors and enthusiasts. The durability and aesthetic appeal of Grand Feu enamel make it a sought-after feature in the world of horology, symbolizing both tradition and excellence in watchmaking.