Cartier Diabolo de Cartier "Happy Birthday" Palladium-Plated Fountain Pen

A distinctive expression of Cartier’s refined design language, the Diabolo de Cartier “Happy Birthday” Fountain Pen features one of the maison’s most recognizable decorative motifs — the celebrated Double-C monogram décor.

Crafted in a luminous palladium-plated finish, the cap and barrel are engraved with Cartier’s repeating interlocking double-C emblem, forming an elegant pattern that subtly reflects light across the surface of the pen. Introduced as part of Cartier’s “Happy Birthday” collection, this décor celebrates the enduring symbol of the house and its unmistakable visual identity.

The pen follows the elegant proportions of the Diabolo de Cartier line, known for its balanced cylindrical silhouette and refined detailing. At the crown sits Cartier’s signature blue cabochon, a hallmark element that has adorned the maison’s writing instruments and jewelry for decades.

Opening the pen reveals a Cartier 18k gold fountain pen nib, designed to deliver a smooth and precise writing experience.

This masterpiece is preserved for 20 years and is offered in brand-new, unused, and outstanding condition and accompanied by its original Cartier presentation box, outer sleeve, and stamped authenticity guarantee, making it an excellent addition for collectors of Cartier writing instruments or those seeking an elegant and distinctive luxury pen.