The Guilloché dials

One of the most refined and common guilloché patterns is the Clous de Paris, also known as the "nail." According to the Fondation de la Haute Horlogerie, the Clous de Paris is a "guilloché dial pattern composed of hollowed-out lines that intersect to form tiny pyramid shapes." This design evokes the image of the cobbled streets of Paris, hence its name. Audemars Piguet adopted and popularized this pattern with its famous Royal Oaks, lending a unique and recognizable touch. In contrast, Rolex has rarely used this technique on its dials, making such pieces extremely sought-after and rare. Rolex's latest interpretation of this motif is found in the magnificent Cellini Prince. (ph: revolutionwatch.com) Also known in English as "Hobnail," "Honeycomb," or "Waffle," this decorative technique has enhanced the appearance of metal parts, especially in watch dials and rotors, since the 18th century. Clous de Paris is a meticulous workmanship performed by hand using a burin or engine turning, creating a series of finely engraved lines that intersect, forming the characteristic Clous de Paris pattern or, in some variations, more complex arabesque designs.