TWSBI Diamond 580

The Diamond 580 is the classic TWSBI pen - the culmination of the line they've been gradually improving for years, and it's really good now.

The piston filling mechanism works well and smoothly, and holds plenty of ink. The clear barrel means you can see when you're running low well in advance, so you don't run out of ink unexpectedly. The style is perfectly TWSBI - crystal clear, cut into a facetted pattern that catches the light, giving the pens their name. The steel nibs are reliably good, and the size and shape is nicely comfortable for most people.

TWSBI Diamond 580

3 products

  • Bottled Fountain Pen Ink

    Choose bottled fountain pen ink if you want the widest color selection and a more refillable writing experience. Bottled ink works with compatible fountain pens using a converter, piston filling system, or other bottle-fill mechanism.

  • Fountain Pen Ink Cartridges

    Choose ink cartridges if you want a simple, convenient refill option with less setup and easier travel. Cartridges are a good choice for everyday writing, school, work, and anyone who wants a faster refill process.

  • Flushing your fountain pen regularly—

    especially when changing ink colors, every six weeks, or before storing the pen—is essential to prevent ink residue buildup, muddy color mixing, and clogged feeds that can lead to scratchy or inconsistent writing.