YSL brooch, featuring the iconic Yves Saint Laurent logo intertwined with a snake design. This particular design is known as the "Opyum" brooch, created by the graphic artist Cassandre (Adolphe Jean Marie Mouron) in 1961. The brooch is made of a gold-toned metal, with textured stripes to resemble a snake. The dimensions are approximately 3.0 inches in length and 0.75 inches in width.