TWSBI Diamond 580 Fountain Pen – Iris on a white background
TWSBI Diamond 580 Fountain Pen – Iris, showing the cap and body on a white background
TWSBI Diamond 580 Fountain Pen – Iris, showing the body on a white background
Close-up of a TWSBI Diamond 580 Fountain Pen – Iris nib on a white background
TWSBI Diamond 580 Fountain Pen – Iris, showing the body and cap on a white background
Close up on TWSBI Diamond 580 Fountain Pen – Iris front part on a black background
TWSBI Diamond 580 Fountain Pen – Iris with multicolored accents on a dark background
TWSBI Diamond 580 Fountain Pen – Iris on a black background
TWSBI Diamond 580 Fountain Pen – Iris on a textured purple and blue surface

TWSBI Diamond 580 Piston Filler Fountain Pen – "Iris" Rainbow

Regular price$85.00
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Shipping calculated at checkout.

Nib Size
  • Low stock - 2 items left
  • Inventory on the way
  • Edition: "Iris" Rainbow — Special Edition featuring a unique multi-colored Titanium Finish
  • Nib: Exclusive Iris Rainbow — Stainless Steel Jowo nib with matching Titanium finish plating
  • Filling Mechanism: Piston Filler — Internal piston draws ink directly into the barrel (approx. 1.9ml capacity)
  • Ink Capacity: Massive — Holds 3x more ink than a standard converter
  • Body: Diamond Faceted — Crystal clear resin barrel catches the light and shows off the ink
  • Maintenance: Fully Serviceable — Includes wrench and silicone grease for home disassembly
  • Dimensions: 142 mm capped, 27g weight — Perfectly balanced for daily writing
  • Origin: Made in Taiwan — Precision engineered for durability

About the TWSBI Diamond 580 Piston Filler Fountain Pen – "Iris" Rainbow

The TWSBI Diamond 580 Piston Filler Fountain Pen – "Iris" Rainbow is a stunning collector's edition that transforms the classic workhorse into a piece of art. Unlike standard chrome models, this edition features a specialized Titanium Finish on the clip, trim, and nib, creating a mesmerizing rainbow spectrum of blues, purples, and golds.

Because of the unique titanium-oxide treatment, no two pens are exactly alike. The finish shifts in color depending on the light, making your pen truly one-of-a-kind. This model retains the beloved smooth clear grip of the original Diamond 580, offering a completely unobstructed view of the ink flowing through the feed.

Ideally suited for bottled ink enthusiasts, it features a high-capacity piston filling mechanism that holds approximately 1.9ml of ink—nearly 3x the capacity of a standard converter. The diamond-faceted barrel prevents the pen from rolling off your desk while catching the light to amplify the rainbow effects.

True to TWSBI’s philosophy of user empowerment, the pen arrives in a presentation box that includes a wrench and silicone grease, allowing you to fully disassemble and lubricate the mechanism yourself—ensuring your pen lasts a lifetime.

In Stock & Ready
Every tool is personally dispatched from our hubs within 48 hours (2 business days).

Standard Tracking (Registered Airmail)

  • Rest of the World: USD8.99 Flat Rate | FREE over USD99 (or equivalent)
  • United States: USD14.99 Flat Rate | FREE over USD150
  • Fully tracked to your doorstep via your national post or trusted local courier.

Expedited Priority (FedEx/DHL)

  • Rest of the World: USD29.99
  • United States: USD39.99
  • The fastest global route. Arrives in 3–5 business days via premium couriers.

Our Logistics Commitment
All orders are handled at our precision fulfillment centers in Hong Kong or Taiwan. For our US community, we absorb a significant portion of import tariffs to ensure your rates remain fair and transparent.

Note: Rates are listed in USD; our system automatically converts these to your local currency at checkout.

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