Blue Gold is a specialized alloy used in watchmaking, renowned for its distinctive blue hue and luxurious appeal. This material is typically created by combining gold with iron and then subjecting the alloy to a controlled heat treatment, which oxidizes the surface and produces a rich, deep blue color. The process requires precise temperature management to achieve a uniform and stable coloration, making Blue Gold both rare and highly prized among horologists and collectors.

In watches, Blue Gold is most often used for decorative elements such as dials, hands, indices, or movement components, where its vibrant color provides a striking contrast to traditional metals like yellow gold, white gold, or steel. The use of Blue Gold not only enhances the visual appeal of a timepiece but also demonstrates the technical prowess and artistic sensibility of the manufacturer. Because the blue coloration is achieved through a surface treatment rather than a coating or paint, it retains the inherent luster and value of gold while offering a unique aesthetic.

Blue Gold is associated with exclusivity and is typically found in high-end or limited-edition watches. Its rarity, combined with the complexity of its production, makes it a symbol of innovation and craftsmanship in modern horology.