Kaweco designed the Dia fountain pen to embody timeless beauty like a "DIAmond". It has classic styling, with a shiny black acrylic body, a solid brass clip, and additional gold-colored accents including a Kaweco logo on the cap. The distinctive knurling on the cap and end of the barrel has been a unique design element since the Dia series was launched in the 1930s. The nib is steel with an iridium point, and comes from renowned nib maker Bock Heidelberg. Its convenient snap-on cap keeps the pen securely closed when not in use. The nib is steel, and gold plated on this gold version. The shiny black body is curvy and elegant. This pen is lightweight and fun to write with.