Cartier’s Le Choeur des Pierres High Jewellery Collection is a Masterclass in Gem Selection and Curation Long before a silhouette is drafted or a clasp engineered, a gemstone is placed on the table in the maison’s ateliers, studied from every angle and scrutinised for its potential. Its proportions would determine balance, colour, rhythm, and intriguingly and just as importantly, its flaws and restraints.