The House of Worth was the couture dynasty founded by Charles Frederick Worth, widely considered the first celebrity fashion designer. By the late nineteenth century, the Worth name carried a prestige that the Cartiers, still building their reputation, could not yet match.

The two families became linked through marriage. On 30 April 1898, Louis Cartier married Andree-Caroline Worth, granddaughter of the founder, at the Church of the Madeleine in Paris. As The Cartiers observes, the Cartiers were still relatively unknown compared to the great House of Worth, but the union brought both money and connections to haute couture. Alice Griffeuille had provided the capital for Alfred's generation; Andree-Caroline Worth would enable Louis to leapfrog into the big leagues through her family's couture success.

A second marriage reinforced the bond. Pierre's sister Suzanne Cartier married Jacques Worth of the same couture family, deepening the ties between the two houses during the Belle Epoque period when both were at the centre of Parisian high society.

These connections gave the Cartier brothers access to the Worth clientele, a network of wealthy and fashionable women who were natural customers for fine jewellery. The alliances illustrate a pattern that recurs throughout the family's history: marriages that were also strategic partnerships, binding commercial dynasties together.