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2. Vickers hardness test - Wikipedia

   en.wikipedia.org/wiki/Vickers_hardness_test

   The Vickers test can be used for all metals and has one of the widest scales among hardness tests. The unit of hardness given by the test is known as the Vickers Pyramid Number (HV) or Diamond Pyramid Hardness (DPH). The hardness number can be converted into units of pascals, but should not be confused with pressure, which uses the same units ...

3. List of mineral tests - Wikipedia

   en.wikipedia.org/wiki/List_of_mineral_tests

   The Mohs Hardness Scale is the main scale to measure mineral hardness. Finger nail is 2.5, copper coin is 3.5, glass is 5.5 and steel is 6.5. Hardness scale is Talc is 1, Gypsum is 2, Calcite is 3, Fluorite is 4, Apatite is 5, Orthoclase Feldspar is 6, Quartz is 7, Topaz is 8, Corundum is 9 and Diamond is 10. Odor; Not always recommended.

4. Rockwell scale - Wikipedia

   en.wikipedia.org/wiki/Rockwell_scale

   A Rockwell hardness tester. The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1]

5. Indentation hardness - Wikipedia

   en.wikipedia.org/wiki/Indentation_hardness

   In the Knoop test, only the longer diagonal is measured, and the Knoop hardness is calculated based on the projected area of the indent divided by the applied force, also giving test units in kgf/mm 2. The Vickers microindentation test is carried out in a similar manner welling to the Vickers macroindentation tests, using the same pyramid.

6. 'Antiques Roadshow': $30 Ring Turns Out To Be Worth Fortune - AOL

   www.aol.com/entertainment/2014-02-18-antiques...

   What you have is a ring that looks like it's eight to 10 carats from the top, and ... it's a diamond.' The appraiser said the ring dated back to the 1920s or 1930s ... and would be conservatively ...

7. Knoop hardness test - Wikipedia

   en.wikipedia.org/wiki/Knoop_hardness_test

   The Knoop hardness test / k ə ˈ n uː p / is a microhardness test – a test for mechanical hardness used particularly for very brittle materials or thin sheets, where only a small indentation may be made for testing purposes. A pyramidal diamond point is pressed into the polished surface of the test material with a known (often 100 g) load ...