Skip to content
Description
TWSBI Diamond 580 Fountain Pen – Red Blue Transparent (RBT) | Piston-Fill Demonstrator Fountain Pen
For fountain pen enthusiasts who love watching their pen work as much as writing with it, the TWSBI Diamond 580 in Red Blue Transparent (RBT) is a standout. This demonstrator-style fountain pen combines a crystal-clear body with bold red and blue accents, letting you see the piston-filling mechanism in action every time you write. If you're searching for a piston-fill fountain pen, a transparent demonstrator pen, or simply one of the best value fountain pens for enthusiasts and beginners alike, the Diamond 580 RBT delivers.
Built for pen lovers who like to see how things work
The standout feature of the Diamond 580 is its piston-filling mechanism — a built-in system that draws ink directly from the bottle with a smooth twist action, no cartridges or converters needed. It's a feature loved by fountain pen enthusiasts for its larger ink capacity and satisfying, mechanical feel. The diamond-faceted, transparent barrel doesn't just look sharp — it also lets you watch ink levels and the piston mechanism at work, while keeping the pen from rolling off your desk when left uncapped.
Designed with everyday practicality in mind
TWSBI built this pen with real writing use in mind: a comfortably tapered grip section for extended sessions, a chromed metal clip and trim for a polished finish, and a rubber O-ring seal on the cap threads that keeps ink from drying out between uses. The screw-cap design ensures a secure, snug fit, while the swappable nib system means you can switch nib sizes down the line without needing a whole new pen.
Quick specifications:
- Brand: TWSBI | Model: Diamond 580
- Origin: Taiwan
- Nib: Stainless steel — Fine, Medium, or Broad
- Body material: Resin, transparent with red and blue accents
- Cap type: Screw-cap with O-ring seal
- Filling system: Piston filler (cartridges not compatible)
- Ink capacity: Approx. 1.98ml
- Dimensions: 142mm capped length, approx. 28g weight
- Warranty: International TWSBI warranty
Who it's for: fountain pen beginners looking to move into piston-fillers, enthusiasts who love demonstrator pens, ink lovers who want to see their colours through a clear barrel, and anyone who wants serious writing performance without a luxury price tag.
Why buy the TWSBI Diamond 580 RBT from Makoba
TWSBI pens are known for exceptional value, and Makoba makes sure that value isn't undercut by fakes or poor sourcing — every pen we sell is 100% genuine, backed by international warranty support. We pack and ship carefully, offer secure checkout, and our team genuinely understands piston-fillers, nibs, and everything fountain pen enthusiasts care about. Buy from Makoba, and get the real TWSBI writing experience, exactly as intended.
Perfect for: everyday journaling, ink testing and ink collecting, fountain pen beginners upgrading their first "real" pen, and gifting to anyone building a fountain pen collection.
Technical Specification
Title
TWSBI Diamond 580 Fountain Pen - Red Blue Transparent (RBT)
Brand
Twsbi
Collection
Diamond 580
Product Origin
Taiwan
Product Type
Fountain Pen
Nib Material
Steel
Nib Size
Fine, Medium, Broad
Colour
Red, Blue & Clear
Cap & Barrel
Resin
Cap Mechanism How to remove the cap of the pen when its closed.
Screw-cap
Ink Capacity - Converter
1.98ml
Ink Filling Mechanism
Piston Filler
Diameter
13.3mm
Postable Can the cap be put on the back of the pen to make it longer.
No
Length When Closed
142mm
Weight of Cap
12g
Weight of Barrel
16g
Total Weight The total weight of the pen including the cap and barrel. The pen is not filled with ink when measuring this.
28g
Warranty
As per International warranty guidelines provided by TWSBI Taiwan
Packaging
Original brand packaging with International warranty card
Customer Reviews
FAQ’s
Wondering what is our return / refund policy?
We do accept returns and refunds. Here are a few things to keep in mind:
- Product has to be in an unused condition with all its tags, warranty certificates and user manuals (if any) in tact.
- Return request is raised within 3 days of receipt of product.
- Consumables like inks, refills and paper products cannot be returned or exchanged.
- For more information on returns and (or) refunds, check out our return / refund policy.
When are orders shipped?
Every order creates an adrenaline rush in our team so any order received before 1PM will usually be shipped on the same day itself. However, due to unforeseen circumstances if we are not able to get your ready, rest assured we will ship it the next day. For more information on shipping, check out our shipping policy section.
Fretting for an online purchase?
We do not consider ourselves as a sales store, but more like your personal consultants.
- Our team is always ready to guide you through your journey at Makoba - whether that is online or in store.
- Thats right! We have 4 exclusive boutiques in the country that are just waiting for you.
- Visit the Our Store page, find your nearest store and connect with us immediately
Wondering the importance of pens in today's digital age?
Your great idea is just waiting to be put on paper. Put that piece of writing instrument into motion and see its magic.
- No digital form will give you as close a satisfaction that you get from writing.
- There's a reason why journaling, note-taking and writing down ideas is no more an outdated activity.
