Hattie Carnegie was a New York-based style maven and retailer from the 1920s to the 1960s. Not only did she discover some of the most important American designers of the 20th century, she designed and sold ready-to-wear, furs, and yes, jewelry. Today Hattie Carnegie costume jewelry is among the most collectible, so stockpile away when you choose a gorgeous vintage bracelet or earrings.