It is said that Jacques used to collect four-leaf clovers in his garden and offer them to his employees as good luck charms.

Source: https://www.chipchick.com/2023/12/van-cleef-arpels-a-french-luxury-jewelry-company-has-been-creating-its-iconic-four-leaf-clover-design-on-bracelets-and-necklaces-since-1968-and-now-older-pieces-have-been-auctioned-for-over-100.html

Marie Lichtenberg’s Clover Orb 18K rose gold, black rhodium, multicolor sapphires, tsavorites, diamonds with enamel four-leaf clover inside (open shot).

Source: https://www.forbes.com/sites/bethbernstein/2023/07/10/spherical-jewelry-has-circled-back-as-a-trend/