The quarrying of Belgian whetstones in the Ardennes is first mentioned in a Roman document. But the story of these natural honing stones goes further back than that. The approx. 480 million-year-old grey yellow sedimentary stones, originating from volcanic ash, are composed of very fine garnet crystals. During honing these are released and in combination with the water and abrasion debris make a honing paste. The garnets only remove fine shavings from the metal and ensure a good polish. Unique combination of speed and grain size.