Diplomat fountain pens can be refilled with standard international-sized ink cartridges or with the ink converter originally provided with the pen and any brand of bottled ink.
Colorado Pen offers international-sized ink cartridges in 31 different colors. This specially formulated ink helps keep your Diplomat fountain pen writing smoothly.
If you still have your original ink converter, Colorado Pen has a large selection of bottled ink from which to choose. Our brand arrives in a huge 90ml bottle. Private Reserve offers standard ink or its premium specialized ink in multiple vibrant colors.