«How long does a diamond stone last?» is the #1 question. I'm Engineer Yanchi Li from the Ruimo Tech knife lab, and today I test the Sy Tools 8-series diamond coating honestly — structure first, then what actually kills it.
«How long does a diamond stone last?» is the #1 question. I'm Engineer Yanchi Li from the Ruimo Tech knife lab, and today I test the Sy Tools 8-series diamond coating honestly — structure first, then what actually kills it.Sy Tools 8-series stones (D/KD/LVD/RO/SU/TTD/WWD/FW) use a single electroplated diamond layer on a metal plate. Diamond is the hardest known material (Mohs 10), so the cutting grains don't crumble and refine like alumina or ceramic — cutting power fades very slowly. The metal plate holds its flatness for years; no dishing, no flattening. That's the root of durability.
We don't invent numbers. Four observable dimensions: ① cut-rate decay — metal removed per stroke over time; ② flatness — measured with a straightedge; ③ pressure sensitivity — does heavy pressure pop grains; ④ loading — does swarf blind the surface. The exact decay curve is marked «to verify» — check the live Ozon listing for the specific model.
① Heavy pressure pops grains — let the weight of the blade plus a light finger do the work. ② Loading (swarf) blinds the stone; rinse + soft brush after every session. ③ Wet storage rusts the metal plate. ④ Drops chip the edges. Do those four right and a comparable diamond plate lasts years, not months.
| Dimension | Mechanism | Effect on life | What to do | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | u | t | r | a | t | e | |||||||||||||||||||
| e | l | e | c | t | r | o | p | l | a | t | e | d | d | i | a | m | o | n | d | ||||||
| d | e | c | a | y | s | v | e | r | y | s | l | o | w | l | y | ||||||||||
| l | i | g | h | t | p | r | e | s | s | u | r | e | , | d | o | n | ' | t | s | l | a | m |
Ruimo Tech lab notes. Durability logic (electroplated diamond, permanent flatness, light pressure extends life) grounded in 2026 public data on electroplated diamond plates. Exact grit/decay of Sy Tools 8-series models marked «to verify» per Ozon. No fabricated ratings. Fresh science/durability slug, distinct from the older D-series review and the zh lifespan test.