Extremely hard ceramic construction ensures long service life and minimal wear
Extra fine grit (approx. 3000 JIS) delivers a super finish for refined cutting edges
Pre-lapped and ready to use with minimal chamfers for immediate installation
Compatible with all Hapstone sharpeners and supports multiple lubricants for versatility
Dense ceramic structure maintains flatness and stable sharpening performance
Summarized by Shop
Hapstone Ruby Ceramic Extra Fine Stone
Extremely hard ceramic sharpening stone designed for edge refinement and fine finishing with minimal wear over time.
Hard ceramic
Exceptional durability
Extremely hard alumina ceramic construction provides outstanding wear resi
This one is evolving. I originally bought it as the finishing stone for minor 3 stone maintenance sharpening. But out of the box it cut much harder than 3k. By the numbers an extra fine (3000 grit) stone should slot in the middle of a SPYDERCO Fine ceramic and the Ultra fine. But it cut much more like the fine(2000 grit). So, I used it in the 2k refining role. It does refine edges well and does some polishing. Over time, it has softened a bit. I think it might have helped if I had initially used a boride stone to condition it. The good news is that the stone barely wears. I’ve used it 7 or 8 times and it is still flat. If it continues to soften it may still fill my expectations as a 3k finishing stone.
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Bruce · March 3, 2026
Very nice 😄
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Michael · April 2, 2026
Smooth, well made and a great stone to follow the 1000 grit CBN.