The disc beneath an abrasive is part of the tool’s description. Yamanashi’s kihoseki reference distinguishes flat-lap work from polishing on a rotating wooden disc.
Technique and structure
The process first describes rough shaping with a chisel and mallet, with pliers used for smaller details. A flat grinding machine then cuts the stone using progressively finer abrasives. For final polishing, the named tool changes to a rotating zelkova-wood disc carrying aoko, identified as chromium oxide. This explains a change in both operation and supporting tool. The supporting tool’s material is therefore a separate part of the description from the abrasive carried on it.
Ask about the actual finish
The account describes skilled manufacture, not a recipe to apply to any gemstone or a buyer’s method for identifying a stone.
For international readers
Confirm the stone and finish with its maker. No home-repolishing, chemical-cleaning or durability recommendation follows from this process outline.
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日本語
山梨貴宝石：平面研磨盤と欅の回転盤を分ける
山梨貴宝石の資料は、タガネ・小槌やヤットコでの成形、平面研磨盤での段階的な研磨、欅の回転盤と青粉（酸化クロム）による木砥みがきを分けています。粒径だけでなく、研磨剤を支える道具の材質と工程を読む解説です。