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  2. Mohs scale - Wikipedia

    en.wikipedia.org/wiki/Mohs_scale

    Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

  3. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    Vickers hardness test; Brinell scale This page was last edited on 16 November 2024, at 12:16 (UTC). Text is available under the Creative Commons ...

  4. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, ... and very hard with a hardness score of 8 to 10 on the Mohs scale. [10] ...

  5. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    Hardness Conversion Table – Brinell, Rockwell,Vickers – Various steels . (Archived) (archived November 11, 2011) Rockwell to Brinell conversion chart (Brinell, Rockwell A,B,C)

  6. Aquamarine (gem) - Wikipedia

    en.wikipedia.org/wiki/Aquamarine_(gem)

    It has a hardness of 7.5–8 on the Mohs scale. [18] [16] While aquamarine often contains no inclusions, [19] it may possess them, with content such as mica, hematite, saltwater, biotite, rutile or pyrite. [15] Its hardness on the Mohs scale of mineral hardness is rated as 7.5-8. [16]

  7. Chrysoberyl - Wikipedia

    en.wikipedia.org/wiki/Chrysoberyl

    Despite the similarity of their names, chrysoberyl and beryl are two completely different gemstones, although they both contain beryllium. Chrysoberyl is the third-hardest frequently encountered natural gemstone and lies at 8.5 on the Mohs scale of mineral hardness, between corundum (9) and topaz (8). [7]

  8. Moissanite - Wikipedia

    en.wikipedia.org/wiki/Moissanite

    Other manufacturers market silicon carbide gemstones under trademarked names such as Amora. On the Mohs scale of mineral hardness (with diamond as the upper extreme, 10) moissanite is rated as 9.25. [4] As a diamond alternative, Moissanite has some optical properties exceeding those of diamond.

  9. Hardness scales - Wikipedia

    en.wikipedia.org/wiki/Hardness_scales

    Hardness scales may refer to: Methods of measuring mineral hardness. Scratch hardness. The Mohs scale of mineral hardness; The Vickers hardness test;