Designed by Harry Bertoia for Knoll, the Diamond Chair is an icon of mid-century modern design. Made from welded steel rods, its airy, sculptural form resembles a faceted diamond. Despite its minimal structure, it's surprisingly comfortable—especially with a seat pad or full upholstery. Available in chrome or powder-coated finishes, it comes in several versions, including the original lounge size, a smaller version, and the high-back Bird Chair. More than just a chair, it's a functional sculpture—Bertoia famously said, "The chair is a sculpture made for sitting."