A compact demonstrator with softness

The TWSBI Diamond Mini White Rose Gold II takes the clarity of the Diamond Mini series and softens it through white accents and warm rose gold trim. The transparent barrel keeps the pen visually alive with your ink choice, while the smaller proportions make it feel more personal and portable than the full size 580 models.

Built around TWSBI’s reliable piston filling system and fitted with a smooth stainless steel nib, this is a compact fountain pen that still feels complete in the hand.

What sets it apart

• Compact piston filler with high ink capacity for its size
• White and rose gold accents create a softer look
• Transparent barrel showcases ink colour and movement
• Posts securely to become a comfortable full length writer
• Shares the reliable stainless steel nib from Eco

Feel in the hand

The Diamond Mini feels more intimate than the larger TWSBI models. Unposted, it stays compact and controlled. Posted, it becomes a surprisingly balanced writer.

The white and rose gold combination softens the technical feel of the demonstrator design. It feels lighter emotionally, without losing the tactile experience of filling and maintaining a piston fountain pen.

Who it’s for

• Writers wanting a compact pen without sacrificing capacity
• Users with smaller hands who find full size pens oversized
• People who prefer softer, warmer colour palettes
• Travellers and everyday carry users
• Fans of rose gold trim who want something refined but practical

Not for

• Users who prefer large, heavier pens
• Writers wanting cartridge/converter convenience
• People who dislike posting smaller pens
• Anyone wanting a completely maintenance free writing system

Practical tips

• The Diamond Mini is designed to post securely by threading onto the back of the barrel. Most users will prefer writing with it posted for full-length balance.

FAQs

Is this beginner-friendly?
Yes. The piston system is straightforward to use and the pen box includes filling instructions.

How much ink does it hold?
The chamber holds approximately 1.3mL of ink, which is still significantly more than most converter pens despite the smaller body.

How does it compare to the Diamond 580?
The Mini is shorter and more portable, with slightly lower capacity. Posted, it becomes close to a full size writer. The 580 feels larger in the hand and holds more ink.

Does the cap post securely?
Yes. The cap threads onto the back of the pen for a very stable posted writing experience.

Can you change nibs?
Yes. The nib unit is removable and replaceable.

Does it come with ink?
No. Bottled fountain pen ink is required.

Is it fragile?
Not with normal use. Avoid over tightening the cap and minimise unnecessary disassembly.

How do you clean it?
Routine cleaning only requires flushing water through the nib and barrel. Full disassembly is only needed occasionally for piston lubrication.

What’s included

• TWSBI Diamond Mini White Rose Gold II Fountain Pen
• Wrench
• Silicone grease
• Presentation box
• Instruction leaflet
• Free nib tuning from LarryPOST

Ink pairing suggestions

• Dusty pinks and burgundies to complement the rose gold trim
• Soft browns and sepias for warmth
• Blue-black inks for elegant contrast
  

Build your practice

• Use with the TWSBI Diamond Ink Well for cleaner filling
• Replacement Diamond Mini nibs for exploring line widths
• De Atramentis Document inks for permanence
  

Specifications

• Brand: TWSBI
• Brand series: Diamond Mini
• Launch: Dec 2022
• Origin: Taiwan
• Nib: Stainless steel
• Nib sizes: EF, F, M, B, 1.1 stub
• Filling system: Piston filler (approx. 1.3mL)
• Body: Transparent polycarbonate
• Trim: Rose gold coloured plated stainless steel
• Cap: Twist
• Grip: Approx. 9mm
• Diameter: approx. 12mm
• Length: approx. 117mm (capped)
• Length: approx. 138mm (posted)
• Weight: Approx. 20g
• Comparable size: Kaweco Sport, Pilot Prera

A compact demonstrator that balances softness and structure, giving you the full piston filling experience in a more portable form.