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2. Sharpening stone - Wikipedia

   en.wikipedia.org/wiki/Sharpening_stone

   The term is based on the word "whet", which means to sharpen a blade, [2] [3] not on the word "wet". The verb nowadays to describe the process of using a sharpening stone for a knife is simply to sharpen, but the older term to whet is still sometimes used, though so rare in this sense that it is no longer mentioned in, for example, the Oxford Living Dictionaries.

3. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, [1] or a flexible surface with hard particles, such as sandpaper. Additionally, a leather razor strop , or strop, is often used to straighten and polish an edge.

4. Sharpening - Wikipedia

   en.wikipedia.org/wiki/Sharpening

   The substance on the sharpening surface must be harder (hardness is measured on the Mohs scale) than the material being sharpened; diamond is extremely hard, making diamond dust very effective for sharpening, though expensive; less costly, but less hard, abrasives are available, such as synthetic and natural Japanese water-stones. Several ...

5. Diamond knife - Wikipedia

   en.wikipedia.org/wiki/Diamond_knife

   Diamond knife blade. A diamond knife is a very sharp knife in which the edge is made from diamond, invented by Humberto Fernández-Morán in 1955. [1] [2] Diamond knives are used for medical and scientific applications where an extremely sharp and long-lasting edge is essential. The knives are very expensive to purchase, depending on the ...

6. List of blade materials - Wikipedia

   en.wikipedia.org/wiki/List_of_blade_materials

   The blade is made of non-rustproof carbon steel, blue-plastered by hand and finely forged from the base to the tip of the knife. The 90 mm (3.5 in) long blade shows patina (dark spots) caused by decades of use. It can easily be sharpened to a shaving sharp edge. Carbon steel is a popular choice for rough-use knives and cheaper options.

7. Lesedi La Rona - Wikipedia

   en.wikipedia.org/wiki/Lesedi_La_Rona

   The main stone, named the Graff Lesedi La Rona, is the world's largest emerald-cut diamond. It is a D-color (totally colorless), high-clarity stone weighing 302.37 carats (60.474 g; 2.1332 oz). According to Graff, the stone is the "largest highest clarity, highest color diamond ever graded by the Gemological Institute of America (GIA)". The ...