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Quick answer
The Black Forest Pen Rhombus Minimo is a pocket fountain pen machined from metal in Germany's Black Forest. It measures 87 mm (3.4 in) closed and 117 mm (4.6 in) with the cap screwed onto the back, is 11.8 mm across and weighs 12 to 38 g by metal. A lozenge pattern milled through the barrel shows the ink.
On this page10 sections
The Rhombus Minimo in polished aluminium, closed and posted, to scale at Black Forest Pen's 87 and 117 mm.
Machined metal body (aluminium, grey anodised aluminium, brass, bronze, stainless steel, blued stainless steel or titanium) or PEEK; Schmidt steel or gold-plated steel nib
Price range
$$$$over $75 per pen (multi-packs divided by the count)
Colors
AluminumPolished
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Notes on these facts
Made by Meleck GbR (Black Forest Pen manufactory, Black Forest, Germany). Made in Germany: Black Forest Pen says design and production take place in its own factory and its parts are made entirely in-house on CNC lathes and a CNC machining centre; only the raw metal, the nibs and the refills are bought in, and those also come from German or Black Forest production. Its home page calls it a family-run manufactory in the Black Forest; its legal notice gives Meleck GbR in Unterkirnach. Source. Price: example listing.
Colors: names per Black Forest Pen, checked October 26, 2026. The eight material options on Black Forest Pen's English product page, each with or without a clip. These are metals and finishes rather than paint colors; bronze darkens with use, as the maker's materials page explains. Tints were sampled from Black Forest Pen's product photos, and for grey anodised aluminium and brass from Galen Leather's; the maker's photo for PEEK shows a metal pen, so PEEK has no tint. Tints are representative, not measured. Shops stock different colors.
Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).
Key takeaways
Black Forest Pen lists the Fountain Rhombus Minimo at 87 mm closed, 117 mm with the cap posted and 11.8 mm across; its product text rounds this to 85 and 120 mm.
Weights run from 12 g in aluminium without a clip to 38 g in bronze with a clip, per the maker's product data.
It comes in 8 materials, from aluminium at €79 (about US$88) to titanium with a clip at €259 (about US$290) in Black Forest Pen's German shop.
Nib units come from Schmidt Technology: steel or gold-plated steel in F, M or B, or a cartridge rollerball tip in F or M.
In the US, Galen Leather stocks it in 4 finishes, with a #5 steel nib in fine or medium.
What is the Black Forest Pen Rhombus Minimo?
It is the short, pocket version of Black Forest Pen’s Fountain Rhombus: a machined metal fountain pen with lozenge-shaped windows milled through the barrel. Black Forest Pen says the pattern is there for looks and so that you can see the ink level at any time.
Black Forest Pen is a small manufactory in Germany’s Black Forest that turns and mills its pen parts itself; our Black Forest Pen story covers the company. The Rhombus Minimo sits in its PremiumLine, beside the plain Classic Minimo and the grooved MultiMill Minimo.
Schmidt steel or gold-plated steel: F, M, B; or a cartridge rollerball tip, F or M
Length closed
87 mm (3.4 in)
Length posted
117 mm (4.6 in)
Diameter
11.8 mm
Weight
12 g (aluminium, no clip) to 38 g (bronze, clip)
Made in
Germany, in Black Forest Pen’s own manufactory
The lengths, diameter and weights come from the variation data on Black Forest Pen’s English product page; its description text rounds the lengths to 85 mm closed and 120 mm posted. Galen Leather’s listings repeat 87 mm, 117 mm and 11.8 mm.
How big is the Rhombus Minimo?
Closed, it is 87 mm (3.4 in) long, shorter than a Kaweco Liliput at 97 mm; posted, it reaches 117 mm (4.6 in). The cap screws onto threads at the back of the barrel, so it stays put while you write.
At 11.8 mm across it is wider than the Liliput’s 9.9 mm and closer to a Kaweco Sport. Even posted, 117 mm is a short pen, so if you prefer a long pen in the hand, the full-size Fountain Rhombus is the one to look at. Our best pocket pens roundup covers other small pens.
Which metal should you choose?
Aluminium if you want a light pen, brass, bronze or steel if you like weight; prices rise with the metal. These are Black Forest Pen’s own figures from its German shop, without and with a clip.
Material
Weight (no clip / clip)
Price, no clip
Price, with clip
Aluminium
12 g / 15 g
€79 (about US$88)
€109 (about US$122)
Aluminium grey anodized
12 g / 15 g
€79 (about US$88)
€109 (about US$122)
Brass
30 g / 36 g
€89 (about US$100)
€119 (about US$133)
Stainless steel
29 g / 34 g
€129 (about US$144)
€159 (about US$178)
Blued stainless steel
29 g / 34 g
€149 (about US$167)
€179 (about US$200)
Bronze
33 g / 38 g
€175 (about US$196)
€205 (about US$230)
PEEK
Not stated
€175 (about US$196)
€205 (about US$230)
Titanium
Not stated
€225 (about US$252)
€259 (about US$290)
Black Forest Pen’s materials page says its bronze is 92% copper and 8% tin and develops a patina with use, while stainless steel and aluminium keep their metallic look for a long time. It recommends aluminium and bronze for people with a nickel allergy.
What nib and ink does the Rhombus Minimo use?
A Schmidt nib unit: steel or gold-plated steel in F, M or B, or a cartridge rollerball tip that writes with fountain pen ink. Black Forest Pen says it buys its nib and rollerball units from Schmidt Technologie and that they fit all its fountain pens, so you can order a spare unit.
Galen Leather describes the nib as a #5 steel nib in fine or medium. Black Forest Pen’s Crucius page says every PremiumLine fountain pen comes with a screwed-in converter that you can swap for a cartridge, but the Rhombus Minimo’s own page doesn’t say how it fills, so check before ordering; our converters explainer covers the common types.
Where can you buy the Rhombus Minimo in the US?
From Galen Leather, the leather pen-case maker, which lists it in US dollars on its US store. Galen carries the Rhombus Minimo in polished aluminium, grey anodised aluminium, brass and stainless steel, pictured with a clip and sold with a fine or medium nib, at over $100 per pen.
Galen says it met Black Forest Pen at the Dutch Pen Show and the Istanbul Pen Fest; our Galen Leather history tells Galen’s story. Black Forest Pen’s own shop is in euros, and it asks customers outside the EU to order by email.
How much does the Rhombus Minimo cost?
It is in our $$$$ price band, over $75 per pen, in every material. The cheapest version, aluminium without a clip, is €79 (about US$88) from the maker, and Galen’s US listings start higher, with every pen pictured with a clip.
Frequently asked questions
How long is the Black Forest Pen Rhombus Minimo?
Black Forest Pen's product data lists 87 mm (3.4 in) closed and 117 mm (4.6 in) with the cap posted, and Galen Leather gives the same figures. The product description rounds them to 85 mm and 120 mm.
Can you post the cap on the Rhombus Minimo?
Yes. Black Forest Pen says the cap screws onto the rear end of the barrel, giving the pen a comfortable writing length of 117 mm (4.6 in) by its product data, or about 120 mm by its description.
Is the Rhombus Minimo heavy?
It depends on the metal. Black Forest Pen lists 12 g for aluminium without a clip and 15 g with one, 29 to 34 g for stainless steel, 30 to 36 g for brass and 33 to 38 g for bronze; it gives no weight for titanium or PEEK.
Who makes the nibs on Black Forest Pen fountain pens?
Schmidt Technology, a German maker that Black Forest Pen calls its partner. Black Forest Pen says it buys its nib and cartridge rollerball units from Schmidt and that they fit all its fountain pens.
Does the Rhombus Minimo come with a clip?
You choose. Black Forest Pen sells every material with or without a clip, and the clip adds €30 (about US$34), or €34 (about US$38) on titanium. The pens Galen Leather sells have a clip.
Is Black Forest Pens the same company as Black Forest Pen?
Yes. The maker calls itself Black Forest Pen, singular, at blackforest-pen.de; Galen Leather lists the same pens as Black Forest Pens and says they are made by Black Forest Pens.
Can you buy a Black Forest Pen in the US?
Yes, through Galen Leather, which lists the Rhombus Minimo in US dollars on its US store. Black Forest Pen's own German shop asks customers outside the EU to order by email.
