A polished stone carving has passed through more than one abrasive operation. Yamanashi’s Koshu crystal-work reference separates shaping stages from the final polishing material.
Technique and structure
The process lists silicon-carbide abrasive at 0.5 mm for rough work, 0.05 mm for the middle stage and 0.005 mm for finish grinding, followed by chromium-oxide polishing. These are the reference’s particle diameters, not knife-whetstone grit numbers. The change in material at the last stage matters as much as the decreasing particle size: calling the entire sequence polishing loses that distinction.
Begin with the actual stone
The same account starts by examining the rough stone’s shape, markings and flaws before deciding what to make. Its named abrasive sequence describes professional manufacture, not a home-repolishing prescription.
For international readers
Ask the maker about the actual stone and finish. A glossy photograph cannot establish the abrasive sequence used.
Global shipping and buying
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日本語
甲州水晶貴石細工：形を削る研磨と最後の磨き
山梨県の工程資料は、炭化硅素の研磨剤を0.5、0.05、0.005mmと替え、最後に酸化クロームで磨くと説明しています。粒径の数値を砥石の番手と混同せず、形を削る段階と最終の磨きを区別します。