The Official Naming Of The Product Is Sharpening Stone but it is known also as < > or < >.It is a natural , non metallic mining constituted at 96-99% from Dioxide of Silicon (SiO2) that it is found in micro-crystal form in the Mountains Of Elouda. Price $38.50. Representing the best quality sharpening stone in the market, Diamond Stones deliver very fast blade and tool edge sharpening across the entire stone surface and are more likely to remain flat than other types of stones. It comes at a higher price point than synthetic stones because it’s quarried from a now-closed underwater mine off the coast of mainland Japan. These stones are mined in the Narutaki District near Kyoto and are well regarded by professionals. 4" x 1.5" x .30" Jasper Standard Size. Japanese natural sharpening stones are becoming scarce because many of the mines are exhausted after centuries of quarrying them. I don't know exactly what kinds of sharpening stones these are. Ancient Ocean Jasper - Wild Whetstones - Natural Whetstones Sharpening - Jade Sharpening Stones - Knife Sharpening - Razor Honing. Natural Japanese sharpening stones are becoming scarce after centuries of quarrying but they are still available today. Not many though. A larger grey/brown one that looks like it had oil on it at one point. So you need a best sharpening stone to keep your knives sharp. The Ancient Ocean Jasper Stones are mostly pure silica which is the main abrasive component in most natural whetstones. I got some sharpening stones from grandfathers shop. Quick View. Diamond stones can also be used dry or with a lubricant, which can make them a good choice for situations where it is impractical to use oil or water. 3" x 1,1/4 x 5/16 Jasper Dressing Stone standard size. Some small ones for doing something like a pocket knife. Quick View. There are different types of sharpening stones in the market, some require any sort of lubricant (oil or water) before usage and some don't require any lubricant. Natural Sharpening Stones For Sale. I am aware there are oil stones and waterstones. The Ancient Ocean Jasper is a natural sharpening stone prized for it's ability to do coarse sharpening all the way to ultra fine polishing. For the most dedicated owners, natural stones provide an unparalleled finish—and the Masuta Natural “Ocean Blue” Sharpening Stone is the best of the best. 5" x 2.5" x 1/2" Ancient Ocean Jasper Barber Hone Standard Size. Some sharpening stones are especially designed to give a finishing touch to your knife, while others are designed to give your dull blade a starting edge. Most of these stones are mined near Kyoto, Japan and are highly sought after by straight razor users and knife enthusiasts. Quick View. Price $60.00. Green with a gritty. 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