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JCK Natures


JCK Natures Blue Moon Series Wa Gyuto (180mm to 240mm, 3 Sizes)

Availability: Normally ships the same day

This beautiful traditional forged knife is called “Blue Moon”, which is青月Seigetsu” in Japanese. This is because we felt that the unique Tsuchime (“Hammered pattern”) dimples and dark-colored Kurouchi (“Black forged”) finish of the blade looked just like the cratered surface of the Moon.

The core of the blades is made from Hitachi Blue Steel No.2 Japanese high carbon steel, which is sandwiched between soft stainless steel for improved corrosion resistance, and thus reduced maintenance. Blue Moon Knife is hand ground and sharpened, and have very good overall fit and finish.

The oval-shaped handles are suitable for both right-handed and left-handed users. They are made of Chestnut wood with black resin ferrule.

The Gyuto is the Japanese version of the classic Western Chef’s knife. It can be used with a variety of different cutting techniques to achieve a wide range of kitchen tasks and is suitable for cutting the vast majority of meats, fish, vegetables and fruits. The Gyuto is true multi-purpose knife.

Knife Model: JCK Natures Blue Moon Series Wa Gyuto

Blade Material:  Blue Steel No.2 Clad

Rockwell Hardness (HRc): 62

Blade Grind and Edge Shape: Double Bevel Edge 50/50

Handle Material: Oval Shaped Chestnut Wood Handle with Black Resin Ferrule

Saya Included: No.


Wa Gyuto 180mm (7")
Cutting edge length: 185mm (7.2")
Total Length: 325mm (12.7")
Blade Thickness: 4.3mm (0.16")
Blade Width: 48mm (1.8")
Handle Length: 125mm (4.9")
Total Weight: 116g (4.0oz)
Wa Gyuto 210mm (8.2")
Cutting edge length: 215mm (8.4")
Total Length: 360mm (14.1")
Blade Thickness: 5mm (0.19")
Blade Width: 48mm (1.8")
Handle Length: 136mm (5.3")
Total Weight: 181g (6.3oz)
Wa Gyuto 240mm (9.4")
Cutting edge length: 245mm (9.6")
Total Length: 395mm (15.5")
Blade Thickness: 5mm (0.19")
Blade Width: 52mm (2.0")
Handle Length: 137mm (5.3")
Total Weight: 206g (7.2oz)



This knife comes with 50/50 double bevel edge geometry for both right and left handed use.

For your information, Japanese Kitchen knives are generally designed for right hand use with a slightly thicker and rounded grinding on the right side blade and a less rounded (almost straight flat) grinding on the left side blade. However, both right and left hander can use the knives that have double bevel edge sharpened 50/50 without problems. 

We believe the quality and cutting performance of Japanese knives are the best in the world, and hope you enjoy fine craftsmanship and sharp edge with your new knife. With proper cares, every Japanese knife should be your special cooking partner for long times.



This is the Carbon steel blade kitchen knife that can get rust and discolor easily, and requires extra care and attention to prevent rust.

  • Please do not put the knife in the dishwasher machine for cleaning.
  • Please do not leave the knife in water or wet condition for long time.
  • After using, please hand wash the blade, bolster and handle thoroughly, and wipe it clean and dry with soft clothes. Please apply Tsubaki oil on the blade and keep it in dry place.
  • This is an extremely sharp knife. Please use special cares in using and storing it.
  • Unlike German made knives, Japanese knife blades are ground to thin cutting edge for sharper cutting and easier re-sharpening. Please protect the edge from hitting hard materials to avoid chipping or cracking.
  • Please do not use it to cut bone or frozen foods, any hard shell foods such as lobster and crab.
  • We recommend using Japanese whetstones to re-sharpen the knife, when it gets dull.
Customer Reviews
4.9 Based on 54 Reviews
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Filter Reviews:
Romain V.
France France
I recommend this product
Good product

Awesome knife, well balanced and very sharp Excellent quality/price

Mike D.
United States United States
I recommend this product
My friend loves it

I bought this as a gift for a friend, who told me they absolutely love it. They said it's the best knife they've ever owned. Well done, JCK!

Christoffer H.
Denmark Denmark
I recommend this product
Chef knife

This is a great knife. Can greatly recommend it. Due to the balance point being more towards the tip it's really a workhorse.

JapaneseChefsKnife.Com JCK Natures Blue Moon Series Wa Gyuto (180mm to 240mm, 3 Sizes) Review
koorosh M.
Canada Canada
I recommend this product
Love my Blue Moon Series Wa Gyuto 180 mm knife

I wanted to have a Japanese high carbon steel knife in order to compare it with my European knives. As expected the JCK Natures Blue Moon knife is sharper. It has been and still is a pleasant and learning experience for me.

JapaneseChefsKnife.Com JCK Natures Blue Moon Series Wa Gyuto (180mm to 240mm, 3 Sizes) Review
Alex W.
United Kingdom United Kingdom
I recommend this product
Great knife to start with

Really nice knife to have as my first Japanese knife. It’s not quite as sharp as I was expecting and seems like it is need of resharpening again now. Lovely to use and lightweight though.

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