MONΛRK x Masuda Yoshihide AO1 Custom Amboyna Damascus Gyuto 230mm

The MONΛRK Prestige Collection represents the highest level of what we create at Kakushin—where exceptional bladesmithing meets fine jewelry. This is not simply a kitchen knife; it is a true one-of-one collector's piece, custom assembled in our workshop for those who appreciate owning something no one else ever will.

The centerpiece of this creation is a certified 1.00-carat lab-diamond, permanently set into the blade as the signature of the MONΛRK Prestige Collection. Graded D Color with VVS1 clarity and accompanied by its IGI certificate, the diamond transforms this knife into something rarely seen—a functional Japanese chef's knife elevated into the realm of fine collectible art.

The blade is forged by Masuda Yoshihide of Masuda Hamono / Kiridashi Factory in Sanjo, Niigata—a small family workshop whose roots trace back to the early Showa era. As a third-generation blacksmith, every stage of production remains under one roof, from forging and heat treatment to grinding and finishing, preserving the traditional Sanjo methods that have earned worldwide respect.

At its heart lies Aogami #1 carbon steel, one of Japan's most celebrated high-carbon steels, renowned for taking an exceptionally refined edge with remarkable sharpness, edge retention, and a crisp, effortless cutting feel. The blade is clad in beautifully layered Damascus beneath a traditional dark kurouchi finish, creating rich depth and ensuring every forged blade possesses its own unique character.

For this MONΛRK edition, the blade has been paired with an extraordinary Amboyna burl mono handle, carefully assembled in-house at Kakushin. Revered among the world's most luxurious woods, Amboyna is prized for its dramatic figure, warm golden-red tones, and remarkable rarity. Its uninterrupted grain flows seamlessly from ferrule to end cap, creating an elegant, timeless silhouette worthy of the blade it accompanies.

The 230mm gyuto profile offers exceptional versatility with a generous heel height for increased knuckle clearance and comfort during extended prep. Measuring approximately 3.8mm at the heel, the spine tapers gracefully toward the tip, providing reassuring power through dense ingredients while remaining agile and precise for delicate work. The carefully rounded and polished spine and choil complete the refined experience in hand.

From the hand-forged Aogami #1 core and Damascus kurouchi finish to the rare Amboyna burl handle and certified 1-carat diamond, every element has been deliberately selected and assembled by Kakushin to create a knife unlike any other. There will never be another built exactly like it—a singular expression of Japanese craftsmanship, luxury, and exclusivity for the collector who demands the exceptional.