TWSBI Diamond 580ALR Prussian Blue Fountain Pen - Clear body with Blue trim
A calm, confident Prussian blueÂ
The TWSBI Diamond 580 Prussian Blue Fountain Pen is built on TWSBI's proven 580ALR model, with deep Prussian blue trim to make it feel less like a resin demonstrator and more like a dependable tool. It's not trying to be showy, but conveys confidence.
It uses the reliable TWSBI 580 piston and a smooth writing nib, widely regarded as one of the strongest everyday performers for consistent writing.
What sets it apart
- Deep Prussian blue trim adds a calm, professional presence
- Transparent body to see and monitor ink level
- Smooth piston system with high ink capacity for long writing sessions
- Easy to change nib units, to explore different line widths
- Easy cleaning and disassembly for long-term maintenance
Feel in the hand
Where some demonstrators feel playful, this Prussian Blue feels strong and dependable. The clear body keeps the mechanical aspects visible, but the blue trim pulls everything into focus. Controlled, but not cold.
Who it’s for
- Writers who prefer focus over decoration
- People building consistent daily writing habits
- Journalers who want a reliable tool for long writing sessions
- Fountain pen users upgrading from entry level models
- Anyone who is trying to build a thinking practice
Not for
- Users looking for more expressive finishes
- Those who prefer opaque or highly decorative pens
- Writers wanting a lightweight pocket style pen
- People who dislike demonstrator models or maintenance
Practical tips
- Twsbi pens are designed for easy maintenance. If you spill ink in the pen cap, use an elastic band wrapped along the length of a pencil to remove the inner cap for cleaning
FAQs
Is this beginner-friendly?
Yes, you dial in the ink at a controlled pace, and will be writing for a couple of weeks before you have to refill. The pen box includes filling instructions.
How much ink does it hold?
The chamber can hold up to 1.9mL, which is 2-3 times a cartridge or converter.
How does it compare to Twsbi Eco?
The Diamond 580 is the more refined everyday writer, with a screw-in nib unit and improved grip section. Eco is simpler and more entry focused.
What's the difference between 580, 580AL and 580ALR?
580 is the base model. AL adds aluminium components. ALR adds a ribbed grip for extra control.
Can you change nibs?
Yes. The nib unit is replaceable and can be swapped even when inked.
Does it come with ink?
No. It is designed for bottled ink use only.
Is it fragile?
Not with the right care. Avoid over tightening the cap during daily use and minimise how often you disassemble the pen.Â
How do you clean it?
Flush water through the piston system until clear. Full disassembly is only needed occasionally for maintenance.
What’s included
- TWSBI Diamond 580ALR Prussian Blue Fountain Pen
- Wrench
- Silicone grease
- Presentation case
- Free nib tuning from LarryPOST
Ink pairing suggestions
- Blacks, deep blues, blue-blacks, graphite and smoky greys
- Subtle shading inks
- Professional, muted ink tones
Build your practice
- Use with the Twsbi Diamond Ink Well for mess free filling
- Replacement nibs are useful for exploring line widthÂ
- De Atramentis Document ink for permanence
- Twsbi Pipe is an attachment to fill from an almost empty ink bottle
Specifications
- Brand:Â TWSBI
- Brand series:Â Diamond 580AL/ALR
- Launch: May 2020
- Origin:Â Taiwan
- Nib:Â Stainless steel
- Nib sizes:Â EF, F, M, B, 1.1 stub
- Filling system:Â Piston filler (1.9mL)
- Body:Â Transparent polycarbonate
- Trim:Â Stainless steel
- Cap:Â Twist
- Grip:Â approx. 10mm
- Diametre:Â approx. 13mm
- Length:Â approx. 142mm (capped)
- Weight: approx. 29g (capped)
- Comparable size:Â Pilot Custom 74, Lamy Studio
The Diamond 580 Prussian Blue is not trying to impress you, but support you.
