“Bringing the craftsmanship of Japanese whetstones to the world.”

ALTSTONE is a Japanese whetstone brand founded with the mission to share high-quality sharpening stones with the world.

Each stone is made through collaboration among trusted Japanese manufacturers — from abrasives and bonding agents to pigments and machinery — representing the spirit of Japanese craftsmanship and precision.

Although ALTSTONE is still a young brand, it has boldly entered an industry long dominated by historic companies.

With innovation, passion, and respect for tradition, ALTSTONE aims to become the new standard in the whetstone world — redefining what Japanese quality means for a new generation of sharpeners.