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)
Expedited Priority (FedEx/DHL)
Our Logistics Commitment
Orders are handled at our precision fulfillment centers in Hong Kong or Taiwan. For our US community, we absorb import tariffs on Standard Shipping to keep rates fair.
*Note: US Expedited couriers invoice recipients directly for individual customs clearance and administrative fees (typically ~USD 30).
Rates are listed in USD; our system automatically converts these to your local currency at checkout.
