Celebrities were a-twinkle at last night’s Tiffany & Co.’s Gatsby-themed Blue Book Ball, which celebrated the jeweler’s new collection of Jazz Age-style jewelry. Guests including Gwyneth Paltrow, Carey Mulligan, Sarah Jessica Parker, who nervously checked and re-checked their borrowed gems as they watched feather-wearing acrobats swing from the ceiling. The Cut chatted with sparkly partygoers about sneaking alcohol Prohibition-style, and all things jewelry; click ahead to see.