Definition
"Diamond Jim" refers to James Buchanan Brady (1856-1917), a flamboyant American businessman and bon vivant. He was renowned for his extravagant lifestyle, especially his enormous collection of diamonds. The nickname highlighted his love for ostentatious displays of wealth. Think of him as the ultimate showman of the Gilded Age, known for his larger-than-life personality and love of luxury. His life was characterized by excess and extravagance.