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JCK Natures

JCK Natures Blue Moon Series BM-5 Wa Gyuto 210mm (8.2 inch)

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 210mm (8.2")
Cutting edge length: 215mm
Total Length: 360mm
Blade Thickness: 5mm
Blade Width: 48mm
Handle Length: 136mm
Total Weight: 181g



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
5.0 Based on 22 Reviews
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Jordan B.
United States United States
I recommend this product
Great first chef's knife

I bought it as my first "real" chef's knife (not a cheap one from the local market). It cuts like a dream out of the box, I don't know how I went without one!

Wilbert G.
United States United States
I recommend this product
Blue moon BM-5 wa gyuto

Love this knife. Recommend handling with care because of the sharpness. Great price and it looks awesome. Thank you JCK, definitely buying more from koki iwahara again.

Wilbert Gonzalez  verified customer review of JCK Natures Blue Moon Series BM-5 Wa Gyuto 210mm (8.2 inch)
Aleksandr F.
Russia Russia
I recommend this product
JCK Natures Blue Moon Series BM-5 Wa Gyuto 210mm (8.2 inch)

Bought this knife as a birthday present for my friend so I haven't use it by myself. At the first glance it's a good knife with proper thin geometry, good fit & finish, OK sharpness out-of-the-box. No info about heat treatment & edge retention but I gueess everything should be fine. Good value for the price.

Barry M.
Canada Canada
Blue moon gyuto 210mm

Quite sharp out of the box ,nice clean look ,beautiful beefy handle ,Nashiji is a character look ,artistic ,rustic and practical ,blue #2 aogami steel is for me a great middle ground sharper than a lot of other metals but tough and less brittle than others.

Barry Moore verified customer review of JCK Natures Blue Moon Series BM-5 Wa Gyuto 210mm (8.2 inch)Barry Moore verified customer review of JCK Natures Blue Moon Series BM-5 Wa Gyuto 210mm (8.2 inch)
Bradford S.
United States United States
The blue moon 8.5” I

The blue moon 8.5” I purchased is really nice knife, has a great look, well balanced and extremely sharp. Very satisfied and will purchase more.

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