
Each clam shell stone produced in our workshop carries specific numbers on its surface.
This numbering system will help us track our products and clarify our liability.
We will continue to make every effort to further improve the quality of our products and our quality assurance system.
*The numbers become visible when the stones are exposed to black (ultraviolet) light.
This new numbering system will help us further improve our quality control and assurance system.
Up until now, manufacturers had no unified sorting standards, which makes it hard for customers to distinguish genuine brand stones from inferior/second-hand ones.
Many customers find it extremely hard to know the true value of clam shell stones. We believe that our newly-introduced numbering system will help customers around the world understand our strong commitment to our products and liability.
For all Go board products, please click here.
For Board craftsman Mr.Torayoshi Yoshida made Go board, please click here.
For Board craftsman Mr.Keiji Miwa made Go board, please click here.
For Board craftsman Mr.Miura made Go board, please click here.
For Go board with legs, please click here.
For Table Go board, please click here.
For Other Go boards such as miniature board, 9*9-ro Go board, Off-spec Go board, etc, please click here.
For all Go stone products, please click here.
For Premium Go stones products, please click here.
For Clamshell Go stones BLUE Label products, please click here.
For Go stones Care Kit products, please click here.





















