Shohonyama Ōhira Uchigumori Renge Japanese Natural Whetstone – 2,780g
Approx. 220 × 80 × 66 mm
A rare, extra-thick #24 size Uchigumori natural whetstone from the legendary Ōhira mine in Kyoto, Japan.
This exceptional piece features beautiful and distinct Renge (lotus blossom) patterns throughout the stone, making it both a high-performance sharpening tool and a highly desirable collector's specimen.
Ōhira Uchigumori stones are highly revered and have traditionally been used in the final stages of Japanese sword polishing. They are world-renowned for producing a flawless, misty Kasumi finish that beautifully accentuates the Hamon (temper line) and Jihada (forged steel grain pattern).
Specifications & Features
Origin: Shohonyama, Ōhira Mine (Kyoto, Japan)
Type: Uchigumori Renge (Lotus Blossom Pattern)
Format: #24 Extra-Thick Block
Dimensions: Approx. 220 × 80 × 66 mm
Weight: 2,780 g
Hardness: Medium to Semi-Hard
Condition: Unused vintage stock
(Requires initial lapping/flattening before use)
Suji (Lines): Minimal and completely safe for sharpening
Protection: Sides and bottom sealed with Ishisan premium water-based protective lacquer
Performance & Application
• Traditional finishing stone for Japanese sword polishing
• Produces an elegant and highly refined Kasumi finish
• Enhances visibility of the Hamon and Jihada
• Excellent for premium kitchen knives and high-end cutlery
• Suitable for woodworking chisels (Nomi) and plane blades (Kanna)
• Smooth sharpening feel with excellent polishing performance
Recommended For
Japanese Sword Polishing
Traditional restoration and finishing work for Nihonto and other fine blades.
Kitchen Knives
Achieving a premium Kasumi finish on carbon steel and laminated knives.
Carpentry Tools
Precision polishing for chisels, plane irons, and other woodworking tools.
Collectors
A rare, investment-grade specimen from one of Kyoto's most famous natural stone mines.
Collector's Note
Large, extra-thick Ōhira Uchigumori stones with strong Renge patterning have become increasingly difficult to obtain. Pieces of this size and condition are seldom encountered on today's market.
Its impressive dimensions, substantial 2,780 g weight, and beautiful natural characteristics make this a standout example for both practical use and long-term collection.
Authentic Shohonyama Ōhira Uchigumori Renge.
Rare extra-thick #24 size specimen with beautiful lotus blossom patterning.
Massive 2,780 g natural whetstone from Kyoto, Japan.
A premium collector-grade and professional-use Japanese natural finishing stone.
