Boucheron's ring is beautifully ridged to resemble the Grosgrain ribbon used in French haute couture houses, where the founder's grandparents once worked. It has been impeccably made in Switzerland from polished 18-karat rose gold. Our favorite thing about the 'Quatre' collection is that each piece looks just as elegant worn alone as it does with similar styles, like this 'Classique' necklace.