on saleTWSBI Diamond 580 Fountain Pen - Iris

Product Code TW-M7449260

In Stock

out of stock

on saleTWSBI Diamond 580 Fountain Pen - Iris

Product Code TW-M7449260

In Stock

out of stock

$80.00
Nib Guide

Not sure which size nib is best for you?

Try our Nib Nook tool to view and compare nib widths using our writing samples. Learn more ›

ENHANCEMENT OPTIONS

The TWSBI Diamond 580 comes with a benchmark piston ink-filling mechanism and has all detachable parts.

This fountain pen features a clear demonstrator body with rainbow-colored iridescent trim and a stainless steel nib accented with iridescent color. The clear demonstrator barrel allows you to see your ink color and remaining ink level. It has a clear grip section and screw-cap, and is presented in a modern clear display case.

The idea behind the TWSBI Diamond 580 was to go back to basics and capture the simplicity and elegance of traditional writing instruments. In recent years, the development and modernization of writing instruments has resulted in traditional writing instruments, such as fountain pens, falling into obscurity. It was TWSBI's goal to bring the past back to life by creating a traditional fountain pen that even modern day society can appreciate.

The TWSBI Diamond 580 is a classic fountain pen with a piston ink-filling system. By fusing the traditional mechanisms of the fountain pen with a modern industrial design, TWSBI has created an eye-catching fountain pen that is simultaneously appreciative of the past and relevant in the present.

TWSBI's belief is that it is important to allow the user to disassemble and reassemble the pen and completely experience the traditional aspects of owning and using a fountain pen. These pens also come packaged with a wrench and silicone grease. Neither of these accessories are intended to be used immediately, as they are for long-term care and maintenance. Additionally, please use extra care if you choose to disassemble the nib and feed, as the feed is very fragile.

Condition
New
Brand
TWSBI
Type
Fountain Pens
Color
Clear
Demonstrator

Whether or not the barrel of the pen is translucent, allowing you to see the ink and filling mechanism inside.

Yes
Body Material
Resin
Cap Rotations

For pens with a screw-cap closure, how many rotations it takes to uncap/recap the pen.

1.25
Cap Type

How the cap is opened/closed from the barrel of the pen. Some common options include Snap-Cap, Screw-Cap, Magnetic Cap, or Capless (no cap).

Screw-cap
Compatible inks & refills

Which ink this pen will accept. Choices include bottled ink and various styles of pre-filled ink cartridges.

Bottled inks
Filling Mechanism

How the pen fills with ink. Click here to watch our video tutorial on common filling mechanisms.

Piston
Grip Material
Resin
Nib Size
Extra-Fine, Fine, Medium, Broad, 1.1mm Stub
Nib Color
Silver & Rainbow
Nib Material
Steel
Postable

Whether or not the cap fits securely onto the back of the barrel when open.

No
Retractable

Whether or not the nib/tip can retract into the body of the pen (usually for click or twist-open style pens).

No
Trim
Rainbow
Diameter - Body
13.3mm (0.52in)
Diameter - Cap (without clip)
14.4mm (0.57in)
Diameter - Cap (with clip)
18.6mm (0.73in)
Diameter - Grip (mm)

Measured from the place most people choose to rest their fingers, which varies with each pen.

10.0mm
Length - Body

The measurement from the back end of the barrel to the tip of the nib.

130mm (5.12in)
Length - Cap
60mm (2.36in)
Length - Nib

The measured length of the visible portion of the nib when it is installed in the pen, from grip to tip.

19mm (0.75in)
Length - Overall (Closed)
142mm (5.59in)
Weight - Body

If a converter is included with the pen, this weight is reflected in the total.

14g (0.49oz)
Weight - Cap
14g (0.49oz)
Weight - Overall (g)
28.0g
Max Ink Capacity - Piston Vac

The maximum volume of ink that can fit in the pen when using the built-in piston or vacuum filling mechanism.

1.98ml

Customer Reviews

Based on 51 reviews
90%
(46)
6%
(3)
2%
(1)
0%
(0)
2%
(1)
K
K.H.
Glad I bought this

When I first saw this pen I was tempted to return it. I had been expecting something more pastel with more blues and purples than what I received. The grey insert in the cap just looked dirty (can't they get a clear plastic?) and the case seemed cheap. (This was the most expensive pen I had ever purchased)
I decided to try it out, because I just don't feel right returning something just because I was disappointed. So glad I did. I got it with the broad nib and it is a wonderful writing experience. It glides across the cheapest paper with ease. It writes in reverse almost as well. I'm really enjoying this pen.

D
Dolores T.
Lovely pen

Lovely pen. This is my new everyday pen. The nib writes smoothly and feels so nice gliding on the paper (Tomoe). I have small hands and this is a perfect size. I would recommend.

A
Anonymous
Great Pen!

The design and functioning is very smooth. The Fine nib is a bit ticker than expected.

N
Nichole

I knew I'd love a stub nib I just couldn't decide which pen to purchase for my stub nib. I went with the TWSBI Diamond 580 because my TWSBI Eco is what I would think would make the perfect stub nib. I'm very happy I made this decision, because I couldn't be happier with the way it writes, the ink flow, and the beautiful appearance of the pen itself. I'd make this same decision over and over again. I am very pleased!

C
Cathi A.
Disappointing fine nib

The pen is BEAUTIFUL to look at, the rainbow trim shimmers and shines. And filling the pen is so so easy with the piston filler! Alas, my fine nib is a bit scratchy and not as good as I expected. I own less expensive pens that write much more smoothly. Pretty in the hand, but nib performance is substandard.

FAQs about Fountain Pens

How do I fill a fountain pen with ink? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

It depends on the pen's filling mechanism, which you can find in the Technical Specs section above. 

Here's a quick definition of the most common filling mechanisms:

  • Cartridge - A small, disposable, sealed plastic reservoir that holds fountain pen ink. These come pre-filled with ink, and typically you just push to insert them into place and you'll be ready to write! Check out our quick guide here.
  • Converter - A detachable and refillable ink reservoir that allows you to use bottled ink in a cartridge-accepting pen. Typically you will install the converter into the grip section, dip the nib/feed into the ink, and twist or pull the converter knob to draw ink into the converter. Here's a video for how to fill a cartridge/converter pen using a LAMY pen as an example.
  • Eyedropper - A pen that utilizes the entire barrel as a reservoir for ink. Ink is directly filled into the barrel, allowing for a high ink capacity. Here's a video on how to do it!
  • Piston - A type of filling system that uses a retracting plunger inside a sealed tube to draw ink into a pen. They are typically either twist or push-operated. These pens cannot accept cartridges or a converter, and only fill from bottled ink.
  • Vacuum - A push-style piston that uses pressure to fill the large pen body with ink. They seal the ink chamber when closed, making it ideal for flying without risk of leaking. Check out our video on how to use a vac filler here.

Check out more info on these filling mechanisms including a video on how to fill each one on our blog.

How do I clean a fountain pen? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

It depends on the filling mechanism, but it mostly comes down to flushing it out with water, and sometimes a little bit of Pen Flush if the ink is really stuck. 

It's a bit easier to show than to tell, so we've put together a few quick videos showing you the process:

How often do I need to clean my fountain pen? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

We recommend a good cleaning every 2 weeks, and any time you change ink colors. 

Water will usually do the trick, but we recommend you use our Goulet Pen Flush if the ink has been left in the pen for a while and could have dried up, or when you’re switching ink colors.

My pen won’t write! What do I do? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

First things first... make sure you have ink in the pen! Be sure that the ink cartridge or converter is seated properly in the pen, and that you aren't out of ink.

We always recommend you give your pen a good cleaning first, using our Goulet Pen Flush, or a drop of dish soap in some water. New pens often have some machining oil residue left in the feed, so a good cleaning often does the trick first.

If that still doesn't work, try priming the feed. This consists of either dipping your pen nib and feed in ink, or forcing ink from the converter down into the feed. 

If it’s still not working after that, please reach out to us so we can help! 

What's your return policy? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

You can submit a return request within 30 days of your order date. You can read all our Return Policies here.

To initiate a return, please submit a request at the Return Portal. Our Customer Care team might reach out to you for more information.

Please note we are unable to accept a return of any Namiki or Sailor Bespoke fountain pen for any reason once it has been used with ink. Please thoroughly inspect and dry test the pen before use.