Picking a diamond stone is less about "the best one" and more about the right grit for the job. Across the Sy Tools diamond families — D, LVD, FW, RO, SU, TTD, WWD — the logic is the same. Here's how Engineer Yanchi Li (Ruimo Tech) chooses grits.
Think of grit like sandpaper for your blade. Low number = coarse (removes metal fast); high number = fine (polishes). Across Sy Tools diamond stones you'll typically see coarse ~120–220, mid 300–600, and fine 1000+. A combo like Sy Tools D-120-320-1000 covers most daily needs: reset, refine, finish.
Most Sy Tools plates are electroplated: a single exposed diamond layer on a rigid base. They cut fast and cost less, ideal for home and travel. The trade-off: once the diamonds wear, the plate is done. Resin-bonded lasts longer but cuts slower — less common in the Sy Tools lineup. For 90% of users, electroplated (D / LVD / FW) is the right call.
Sy Tools diamond stones work dry — perfect for a quick touch-up on a job site. For longer sessions, a splash of water floats away swarf so the surface doesn't load. Avoid oil (it clogs). Surface type: an interrupted (dotted/holed) face clears swarf; a continuous face gives full contact for pointed tools. Both appear across the Sy Tools families.
| Stage | Grit | Sy Tools pick |
|---|---|---|
| Repair (chips) | ~120–220 | D / FW coarse block |
| Maintain | 300–600 | D / LVD mid block |
| Refine | 1000+ | D-1000 / FW fine |
| Polish | high-grit | Sy Tools high-grit natural |
| De-burr | — | KD-A11 / wood-strops |
Match the stone to the blade's condition, not your mood. A dull, chipped edge starts coarse; a "just not sharp" edge can start at 600. Finish every session on Sy Tools KD-A11 or wood-strops.
Start with a Sy Tools D combo (e.g. D-120-320-1000) for 90% of tasks; add an LVD plate if you're on an angle-guided system, an FW broad combo for full coverage, and a high-grit natural for mirror finishes. Price and stock per Ozon (stones roughly $4.99–14.99).
Ruimo Tech lab notes. Grit logic is general diamond-stone practice applied to the Sy Tools families; exact per-SKU grit numbers are marked "to be verified" per Ozon. No scores, no quoted reviews.