TWSBI Precision Fountain Pen - Gemini Blue

Precision engineering, softened by colour

The TWSBI Precision Fountain Pen Gemini Blue takes the industrial confidence of the original Precision series and gives it a quieter emotional edge. The machined metal body still feels exact and deliberate, but the Gemini Blue finish introduces a calm feel.

What sets it apart

• Machined aluminium body for a solid, engineered feel
• Gemini Blue finish adds depth without becoming flashy
• Clean hexagonal design prevents rolling and enhances grip
• Shares reliable stainless steel nib of the 580
• Substantial feel in the hand without becoming overly heavy

Feel in the hand

The Precision series leans into clean lines and functional design. Gemini Blue softens the technical feel without losing the pen’s sense of structure and control. The result is a pen that feels dependable and grounded to use daily.

Who it’s for

• Designers, architects, and technical thinkers
• Writers who enjoy metal-bodied pens
• Journalers wanting a clean, minimalist aesthetic
• Users seeking a dependable everyday fountain pen

Not for

• Users wanting a lightweight resin pen
• Writers who prefer decorative or ornate styling
• Those wanting a demonstrator fountain pen
  

Practical tips

• Most popular nib size for Precision is Fine. Writes a 0.4mm line which works well for Western scripts and use in business.

FAQs

Is the Precision heavier than a TWSBI Diamond 580?
Yes. The machined metal body gives it a more substantial and grounded feel in the hand.

What does the Gemini Blue finish look like in person?
It’s a restrained, muted blue rather than a bright saturated colour. It has a slightly industrial in tone.

Is this pen suitable for everyday use?
Yes, the durable aluminium construction and dependable nib make it an excellent daily writer.

Does the hexagonal shape feel uncomfortable?
No. The facets are subtle and help create grip stability without sharp edges.

Is the nib interchangeable?
Yes. TWSBI nib units can generally be swapped or serviced depending on model compatibility.

What’s included

• TWSBI Precision Fountain Pen Gemini Blue
• Wrench
• Silicone grease
  
• Presentation box
• Instruction leaflet
• Free nib tuning from LarryPOST

Build your practice

• Use with the TWSBI Diamond Ink Well for cleaner filling
• Swap out the bare nib from a Diamond 580 nib unit to explore line width
• De Atramentis Document inks for permanence

Ink pairing suggestions

• Blue-black, slate and graphite greys
• Dark teal inks
• Technical looking permanent inks
  

Specifications

• Brand: TWSBI
• Brand series: Precision
• Launch: April 2025
• Origin: Taiwan
• Nib: Stainless steel
• Nib sizes: EF, F, M, B, 1.1 stubs
• Body: Machined aluminium
• Trim: Gemini Blue anodised finish
• Cap: Twist
• Grip: approx. 10mm
• Diametre: approx. 13mm
• Length: approx. 140mm (capped)
• Weight: approx. 34g (capped)
• Comparable size: Lamy Studio, Faber-Castell e-motion

The Precision Gemini Blue feels like a pen for clear thinking. Solid and technical, without feeling sterile.