{"product_id":"dr-marv-coarse-diamond-sharpening-stones","title":"Dr. Marv Coarse Diamond Sharpening Stones [80, 60, 40 µm]","description":"\u003cp\u003e\u003cstrong\u003eDr. Marv's Scientific Sharpening Stones, Coarse Set.\u003c\/strong\u003e Resin-bond diamond stones, handmade by Dr. Marv in the German Alps, in the 1\" x 6\" size for fixed-angle sharpeners.\u003c\/p\u003e\n\u003ch3\u003eWhat it's for\u003c\/h3\u003e\n\u003cp\u003eSetting a new bevel, repairing chips and reprofiling. Dr. Marv makes the coarse stones with a reformulated, heat-tempered bond that's harder than his medium and fine stones, plus a higher diamond concentration, so they hold up to heavier work.\u003c\/p\u003e\n\u003ch3\u003eWhat's in the set\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e80 µm\u003c\/li\u003e\n\u003cli\u003e60 µm\u003c\/li\u003e\n\u003cli\u003e40 µm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eStones are rated by their nominal diamond particle size in microns (µm), the way Dr. Marv tests and publishes them.\u003c\/p\u003e\n\u003ch3\u003eHow they're made\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDiamond abrasive in a resin bond on an anodized aluminum blank\u003c\/li\u003e\n\u003cli\u003eEach surface is dressed with a single-point diamond chisel instead of conventional flattening\u003c\/li\u003e\n\u003cli\u003eUse with a honing oil, which is how Dr. Marv tests his stones\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrom Dr. Marv's testing\u003c\/h3\u003e\n\u003cp\u003eIn his own review, the 80 µm stone left a smooth, even bevel with a slightly toothy apex, a good fit for outdoor and hard-use knives. \u003ca href=\"https:\/\/drmarv.com\/2025\/09\/26\/a-brief-study-on-sharpening-stones-part-34-dr-marvs-scientific-sharpening-stone-80-%c2%b5m-diamond-resin\/\" rel=\"noopener\" target=\"_blank\"\u003eRead his 80 µm study\u003c\/a\u003e or the \u003ca href=\"https:\/\/drmarv.com\/2025\/10\/04\/a-brief-study-on-sharpening-stones-part-35-dr-marvs-scientific-sharpening-stone-60-%c2%b5m-diamond-resin\/\" rel=\"noopener\" target=\"_blank\"\u003e60 µm\u003c\/a\u003e and \u003ca href=\"https:\/\/drmarv.com\/2025\/10\/05\/a-brief-study-on-sharpening-stones-part-36-dr-marvs-scientific-sharpening-stones-40-%c2%b5m-diamond-resin\/\" rel=\"noopener\" target=\"_blank\"\u003e40 µm\u003c\/a\u003e studies.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eA message from Dr. Marv\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1x Stone 80 μm\u003cbr\u003e1x Stone 60 μm\u003cbr\u003e1x Stone 40 μm\u003cbr\u003eSize of the Aluminum Blank: 159 x 25 mm x 3 mm\u003cbr\u003eSize of the Abrasive Layer: 150×25 + At least 4 mm thickness\u003cbr\u003eDiamond Concentration: \u0026gt;65% by weight!\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThese are the “Dr. Marv’s Scientific Sharpening Stones”. They have anunheard of concentration and are absurdly pure and contamination free.This was achieved by very tight, electron microscopy quality control,followed by manufacturing in a laminar flow box. Dressing is done via singlepoint diamond chiseling, which also stops any contamination. Moreover,every set is diamond chiseled individually in the same fixture, so thestones are very, very close in their thickness. I personally do not feel theneed to adjust the angle when switching from one stone to the next.\u003c\/p\u003e\n\u003cp\u003eTheir development is based on my scientific research into abrasives. Ifirmly believe that these are super high performing abrasives!\u003c\/p\u003e\n\u003cp\u003eI am very proud to say that the resin, filament, foam, chemicals andaluminium are Made in Germany. Machining of the aluminium blanks wasdone in Germany. Only the diamond is imported, but meticulously quality\u003cbr\u003e\u003cbr\u003eAs this is a handmade product, some small blemishes such as tiny bubbles, scratches or imperfections are to be expected. I can promise that they do not subtract from the performance of the sharpening stones!\u003c\/p\u003e","brand":"Dr. Marvin Groeb Abrasive Solutions","offers":[{"title":"Default Title","offer_id":67722311303485,"sku":"STN-DRMARV-COARSE","price":444.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0982\/3626\/8861\/files\/Course.2.png?v=1792516589","url":"https:\/\/getsharpusa.com\/products\/dr-marv-coarse-diamond-sharpening-stones","provider":"Get Sharp","version":"1.0","type":"link"}