# TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent

## The lightest of the Diamond 580 pens

The TWSBI Diamond 580 is the original expression of the Diamond series, built around a traditional piston filler and a full demonstrator design that puts the internal mechanics on display. With a clear view of ink movement and the filling system, it brings you closer to the act of writing itself.

This model reflects the foundation of TWSBI’s design philosophy, with a lighter construction than the AL and ALR variants, making it especially suited to longer writing sessions. Also available as a [sketching kit.](https://www.larrypost.com.au/collections/larrypost-art-supplies-sketch-kits/products/twsbi-diamond-sketch-kit-red-blue-fine-da-doc-ink)

## What sets it apart

-   Full demonstrator design showing ink colour, movement and level
-   Comfortable grip section (narrower than Eco) for long writing sessions
-   Reliable TWSBI piston, with double the capacity of converter pens  
    
-   Cartridge-free, but still easy to use
-   Designed to be disassembled, giving you control over maintenance
-   Screw off nib unit, for easy nib changes

### Feel in the hand

When you can see the ink move, filling the pen becomes part of the writing ritual rather than a separate task. It slows the process just enough to set the tone before you begin. Writing feels more intentional, as though the pen helps you settle into the session.

### Who it's for

-   People upgrading from entry level fountain pens like Eco
-   People planning to use their pen for long writing sessions
-   Ink explorers who want to see more of their ink
-   Writers who enjoy mechanical interaction with their tools
-   Anyone trying to build a daily writing practice

### Not for

-   People who prefer opaque designs that hide the ink
-   Users who want zero maintenance  
    
-   Heavy handed users who need an indestructible pen design

### Practical tips

-   If you spill ink in the pen cap, use an elastic band wrapped around the end 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 offers a more refined grip, a screw-in nib unit, and a more premium writing feel. The Eco is simpler, lighter, and more entry-focused.  

**What's the difference between 580, 580AL and 580ALR?  
**580 is the base model. AL adds aluminium parts. ALR adds ribbing on the grip for extra control. Most current releases are ALR-based.  

**Can you change nibs?**  
Yes. The nib unit is fully replaceable and can be swapped even when inked.  

**Does it come with ink?  
**No. It is designed for bottled fountain pen inks 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. 

**How do you clean it?**  
Routine flushing with water is sufficient. Full piston lubrication is only needed occasionally over long-term use.  

### What’s included

-   TWSBI Diamond 580RBT Fountain Pen
-   Wrench
-   Silicone grease
-   Presentation box
-   Instructions leaflet
-   [Free tuning option](https://www.larrypost.com.au/blogs/blogs/smooth-writing-with-fountain-pens?_pos=2&_sid=a2392eaaf&_ss=r) from LarryPOST

### Ink pairing suggestions

-   Any fountain pen ink will work
-   Vibrant inks to show off colour in the barrel
-   Dye-rich [Pilot Iroshizuku inks](https://www.larrypost.com.au/collections/larrypost-brands-pilot-pen?filter.p.m.magento.brand_series=PILOT+Iroshizuku) reliably flow well in Twsbi pens

### Build your practice

-   Use with the [Twsbi Diamond Ink Well](https://www.larrypost.com.au/collections/larrypost-brands-twsbi?filter.p.product_type=Fountain+Pen+Ink+Well) for mess free filling
-   [Replacement Diamond 580 nibs](https://www.larrypost.com.au/collections/larrypost-brands-twsbi?filter.p.m.magento.brand_series=TWSBI+Eco&filter.p.product_type=Fountain+Pen+Replacement+Nib), for exploring line width 
-   [De Atramentis Document ink](https://www.larrypost.com.au/collections/larrypost-brands-de-atramentis?filter.p.product_type=Waterproof+Bottled+Ink) for permanence
-   [Twsbi Pipe](https://www.larrypost.com.au/products/twsbi-pipe-needle-attachment-for-refilling-fountain-pens?_pos=1&_sid=4c8088925&_ss=r) is an attachment to fill from an almost empty ink bottle

### Specifications

-   **Brand:** TWSBI
-   **Brand series:** Diamond 580
-   **Launch:** 2012
-   **Origin:** Taiwan
-   **Nib:** Stainless steel
-   **Nib sizes:** EF, F, M, B, 1.1 & 1.5mm stubs
-   **Filling system:** Piston filler (1.9mL)
-   **Body:** Transparent polycarbonate
-   **Trim:** Stainless steel
-   **Cap:** Twist
-   **Grip:** approx. 10mm
-   **Diametre:** approx. 13mm
-   **Length:** approx. 142mm (capped)
-   **Weight**: approx. 26g (capped)
-   **Comparable size:** Lamy Safari, Pilot Metropolitan

A pen that celebrates TWSBI's origin story of bringing you closer to writing.

## Details

- **Price:** 109.95 AUD
- **Vendor:** TWSBI
- **Type:** Fountain Pen
- **Tags:** Category_LarryPOST, Category_LarryPOST/Brands/TWSBI, Category_LarryPOST/Brands/TWSBI/TWSBI Diamond 580, Category_LarryPOST/Pens, Category_LarryPOST/Pens/Fountain Pen

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Extra Fine | 109.95 AUD | In stock |
| Fine | 109.95 AUD | In stock |
| Medium | 109.95 AUD | In stock |
| Broad | 109.95 AUD | In stock |
| 1.1mm Stub | 109.95 AUD | In stock |

## Images

- TWSBI Diamond 580 Fountain Pen - Red / Clear / Blue (limited edition)
- TWSBI Diamond 580 Fountain Pen - Red / Clear / Blue (limited edition)
- TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent
- TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent
- TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent
- TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent
- TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent
- TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent
- TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent
- TWSBI Diamond 580RBT Fountain Pen - Red / Blue / Transparent

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> Source: [LarryPOST](https://www.larrypost.com.au/products/twsbi-diamond-580rbt-fountain-pen-red-blue-transparent)
> Updated: 2026-07-03