4.75 out of 5
Based on 8 reviews.

In stock
Brand: TWSBI


The TWSBI Diamond 580 RGT II is a fountain pen with piston filling system. The TWSBI Diamond 580 is made of polycarbonate, with rose goldplated details. The cap is smooth while the barrel is faceted. The TWSBI Diamond 580 RGT II fountain pen has clear barrel that shows the mechanism very well. The clear body gives the TWSBI also a different look witht he ink it is filled with. The TWSBI logo finish the top of the cap.

The TWSBI Diamond 580 Fountain pen has a polished stainless steel nib engraved with the TWSBI logo, available in several sizes.

TWSBI fountain pens can be entirely disassembled for the purposes of cleaning and servicing. Instructions and necessary tools are supplied with each TWSBI fountain pen. Please note that the disassembly feature is only there for experienced users and is not necessary for normal use. Disassembly is at your own risk!

With a history of more than 40 years of manufacturing, including producing high-end pens for other brands, Ta Shin Precision decided to start selling under their own brand, TWSBI. The name TWSBI is made up from TWS and BI. ‘TWS’ is the reversed initials of the phrase ‘San Wen Tong’, translated Hall of Three Cultures, and ‘BI’ literally means writing instrument.

Additional information

Writing system


Nib width

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Nib content

Filling system



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Closing System


Length closed

Length barrel

Length posted

8 reviews for TWSBI Diamond 580 RGT II Fountain pen

  1. English

    LUCIE BONGIORNO (verified owner)

    Beautiful pen, I love it with Herbin rouille d’ancre!

  2. English


    Ik vind de TWSBI pennen heel mooi. De transparante pen, dat je de inkt ziet, ziet er goed uit. Kwaliteit is alleen wel minder. Je mag de dop niet te strak dicht draaien, anders gaat deze kapot bij de verbinding tussen het glazen dopje en de stalen schroefrand. Ik had een TWSBI rose gold, daar is de dop kapot gegaan en kan je de pen weg gooien. Zonde.

    De pen zelf schrijft wel snel naar je hand. Het ziet er mooi uit. Nadeel aan een fountain pen is dat er inktdruppels aan de binnenkant van de dop komen. Is lastig weg te halen. Omdat bij deze pen de dop van rookglas is, zie je de druppels niet zo goed en is het minder storend.

  3. English

    Cristina D.

    This model from TWSBI is not only elegant and fancy but also a very good quality pen! I fell in love with this brand when I saw one of these pens being used by one of mu colleagues and I just had to have it! I now own 5 TWSBI pens and still counting! The smoke version is my favorite! All of them write extremelly well right out of the box! Personnaly I would choose a TWSBI any day over a Kaweco or Lamy for example, the nibs of TWSBI are just simply perfect! It is a surprising quality for the nibs and the entire craftsmanship of the pen coming from Taiwan and in plastic, one would not expect it

  4. English

    S (verified owner)

    The pen arrived in perfect condition and I even got 2 mini stroopwafels. This is my first TWSBI pen and it writes very smoothly. It’s about the same size as my Lamy Safari AL Black, but it looks much more premium and writes as butter.
    The pen was delivered within the estimated delivery time (which was 2-3 weeks in my case).

  5. English

    Jacques Exbrayat

    Le service Appelboom a été parfait. On m’avait annoncé un peu de retard dans la livraison de mon produit et je l’ai reçu plus tôt que prévu. Le stylo était dans sa boite d’origine, emballé dans un papier cadeau. En prime, deux petites friandises à déguster avec l’ouverture de mon paquet.
    Le TWSBI DIAMOND 580 RGT II est tout à fait le stylo qui me convient. La plume B procure une sensation de fluidité et l’épaisseur du trait donne une écriture très chaleureuse. C’est mon 2ème TWSBI 580, mais celui-ci est du plus bel effet avec ses couleurs rose et noir. Il ne me quitte plus!

  6. English

    Ana G Csiky (verified owner)

    The elegance of the smoked demo details contrasting with the rose gold furniture of this limited edition TWSBI is what caught my attention. The B nib is super smooth and I simply can’t stop writing with this pen since I got it about a month ago. So far I have paired it with darker looking pink inks and near black inks. It always looks fantastic and writes impeccably! Super happy with this TWSBI that is outshining all my other TWSBIs!

  7. English


    The Twsbi Diamond is a really beautiful fountain pen with a great size.
    It’s perfect. The only think I have to note is, that the Nib of the Twsbi Eco writes smoother than the Diamond, which I prefer more. But that’s a matter of taste!

  8. English

    Douglas Rathbun (verified owner)

    I did a YouTube review of my TWSBI Diamond 580 Rose Gold II with a Broad nib.
    See it here:

Show only reviews in English (8)

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