It’s not the Oscars without a whole lot of sparkle—and not just any diamonds will do for Hollywood’s biggest night. So at the 2019 Oscars, stylist Petra Flannery headed all the way to Geneva, Switzerland to tour the Cartier archives in order to find the perfect pieces for Amy Adams, nominated last night for Best Supporting Actress. “Touring the archives was a magical experience,” Flannery told W. “Learning about the history and trying on jewelry that once belonged to some of the most famous style icons of all time was a privilege.” And the long trip yielded the perfect piece: Cartier’s 1935 Pyramid Brooch crafted out of platinum and diamonds. “Its Deco allure was just the right design for Amy’s elegant look,” Flannery said. “We paired it with a 37.46 carat diamond necklace, and voilà!” The jewels complimented Adams’s custom Versace dress for a look that Flannery called “modern glamour.” And indeed it was. Here, a closer look as Adams got ready for the big night.