Exclusive replica of the Diable Kuro katana – T-10 steel, Choji Hamon

Exclusive functional katana Diable Kuro – T10, genuine Chōji hamon

Diable Kuro represents a higher class of functional replicas of traditional Japanese swords. It offers a sharp blade made of high-quality T10 carbon steel, genuine differential hardening, an edge hardness of approximately 58 HRC and a distinctive, naturally formed Chōji-type hamon.

The blade in traditional shinogi-zukuri geometry is made without a bo-hi groove and therefore retains a full, robust profile. The blade length including habaki is 735 mm / 73.5 cm, and the overall length of the katana without saya is 100 cm.

The higher level of craftsmanship is also evident in the koshirae. The katana features black-and-gold metal details, menuki with the motif of the Japanese Oni demon, black ito, a light samegawa base and a luxurious glossy black saya with golden glitter flakes. The stressed parts of the scabbard – koiguchi, kurigata and kojiri – are made of natural horn.

Diable Kuro is intended for more demanding collectors and enthusiasts of Japanese swords who are looking for a combination of a functional blade, genuine hamon and exceptionally refined details.

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At the heart of the Diable Kuro katana is a sharp functional blade made of high-quality T10 carbon steel. This high-carbon steel is used for quality functional Japanese blades thanks to its ability to reach high hardness, retain an edge very well and respond suitably to differential heat treatment.

The edge of this model reaches a hardness of approximately 58 HRC. Combined with the full blade profile without bo-hi and traditional shinogi-zukuri geometry, this creates a strong and distinctive blade that matches the character of a higher-class functional replica.

You can find more about steels used for Japanese swords in the article Katana blade – complete overview of steels, types and quality.

The blade is differentially, or partially, hardened. The edge area gains higher hardness, while the spine and body of the blade retain greater toughness.

It is precisely this method of heat treatment that creates a genuine hamon. It is therefore not an artificially ground, printed or merely surface-created line, but a natural result of the different hardening of individual parts of the blade.

You can find more about genuine hamon in the article Hamon – partial hardening of the blade.

A characteristic feature of Diable Kuro is the genuine Chōji (丁子) hamon. Its rich and irregularly undulating pattern resembles clove flowers or buds and creates a striking visual effect on the polished surface of the blade.

Chōji is one of the traditional and visually attractive hamon forms. On the Diable Kuro model, it is not merely a decorative motif – it is the result of genuine differential hardening of T10 steel.

The blade has traditional shinogi-zukuri geometry, one of the most typical constructions of Japanese katana. The pronounced longitudinal shinogi line separates the main blade surfaces and supports a suitable balance between strength and cutting geometry.

Towards the tip, the blade transitions into a traditionally shaped kissaki, separated by the yokote line. The blade is made without bo-hi, and therefore retains a fuller and more robust profile.

The tsuka handle is fitted with a firm black ito wrapping. The regularly arranged tsukamaki creates characteristic diamond-shaped hishi openings beneath which the light samegawa base provides contrast.

The combination of black wrapping and a light base creates a classic Japanese aesthetic while also providing a suitable background for the distinctive black-and-gold metal elements of the handle.

More about handle construction: Tsuka, Ito and Samegawa.

A striking part of the handle is the black-and-gold menuki with the motif of the Japanese Oni demon. The sculpted face with contrasting golden details stands out from the black tsuka wrapping and emphasises the dark character of the Diable Kuro model.

In Japanese mythology, Oni are demonic and supernatural beings associated with strength, danger and protection from evil.

You can find more about menuki here: Menuki – decorative and functional element of the katana.

The katana is complemented by a dark decorative tsuba with contrasting golden details. Its craftsmanship continues the dark black-and-gold aesthetic of the handle and visually connects the individual koshirae elements into a unified whole.

Between the tsuba and the blade is a golden habaki, which surrounds the blade at the transition to the handle and ensures the blade is correctly seated in the saya scabbard.

More about the tsuba: Tsuba – guard, hand protection and katana style.

One of the details that clearly distinguishes the Diable Kuro katana from simpler models is its sophisticated glossy black saya with golden glitter flakes.

The golden elements are finely dispersed across the black surface and stand out best as the angle of incident light changes. From a greater distance, the scabbard appears elegant and almost minimalist, but up close it reveals a considerably more sophisticated texture.

The result is a luxurious black-and-gold combination that perfectly matches the tsuba, menuki and other metal details of the katana.

The higher level of craftsmanship of the Diable Kuro model is underlined by the use of natural horn on three important parts of the scabbard – koiguchi, kurigata and kojiri.

Koiguchi reinforces the mouth of the saya where the habaki seats when the blade is inserted. This is a highly stressed part of the scabbard, so hard horn provides greater mechanical resistance here.

Kurigata serves as a firm attachment point for the sageo. Horn is suitable thanks to its strength, smooth surface and long service life.

Kojiri protects the lower end of the saya from mechanical damage. The horn end piece also looks elegant and traditional.

The use of horn on these stressed parts is one of the details that distinguishes more sophisticated koshirae from ordinary basic replicas.

The saya is complemented by a strong black braided sageo, routed through the kurigata made of natural horn. The black colour matches the tsuka-ito and glossy saya while allowing the subtle golden details of the scabbard to stand out.

A Japanese katana is a sophisticated whole in which every component has its significance. In the image below you will find the basic terminology for the blade, handle and scabbard. Below the image, you can click individual terms to open a more detailed explanation in the Nože a Katany magazine.

Click the highlighted names to open a more detailed article in a new window.

Tsuka – handle | Ito – wrapping | Samegawa – ray skin | Menuki | Mekugi | Fuchi | Kashira | Tsuba

Hamon | Shinogi | Shinogi-ji | Ji / Hira-ji | Mune | Ha | Yokote | Kissaki | Bo-hi | Nagasa | Sori

Saya – scabbard | Koiguchi – mouth of the scabbard | Kurigata – sageo attachment | Shitodome | Sageo – cord | Kojiri – end of the scabbard

Diable Kuro offers a combination of T10 carbon steel, differential hardening, genuine Chōji hamon, edge hardness of approximately 58 HRC and traditional shinogi-zukuri geometry.

The higher level of the model is also evident in the koshirae details: koiguchi, kurigata and kojiri made of natural horn, distinctive black-and-gold Oni menuki, decorative tsuba, black ito and a luxurious glossy black saya with golden flakes.

Diable Kuro is a katana for the more demanding collector who appreciates not only the quality of the blade itself, but also the refinement of all constructional and decorative details.

T10 carbon steel requires regular care. After handling, we recommend cleaning the blade, removing fingerprints and then applying a very thin layer of suitable protective oil. Always store the katana with a clean and dry blade.

More about proper care: How to care for a katana – cleaning, oiling and maintenance.