Hardness 10, you can scratch any substance with diamonds. According to the mutual characterization of the materials, a "standard hardness tester" was created, which is a square box measuring 65 mm x 55 mm x 23 mm, which is set with 4 standard hardness sheets, which are all precision ground. The surface is as clean as a mirror. The surface of natural jade is very bright, and the Mohs hardness of the four standard hardness sheets is 6, 7, 8, and 9, respectively. The gemstone to be measured (either the finished product or the original stone that has not been ground) can be found in a pointed building, and the standard piece with a hardness of 6 is lightly scored, and then observed with a magnifying glass. If the standard piece has no scar, it means that the gemstone Hardness is less than 6, no need to test again. If the surface of the standard sheet has a thin line-like flaw that cannot be wiped off, indicating that the hardness of the stone is higher than 6, the standard sheet with a hardness of 7 should be continued. If the scratch is not moving, the hardness of the stone is 6-7. If scratched, continue to score a standard sheet of hardness 8. By analogy, the hardness of all gemstones can be divided into 5 categories, ie hardness less than 6; hardness is 6~7 (including 7); hardness is 7~8 (including 8); hardness is 8~9 (including 9); hardness Above 9. In the identification of true and false rubies, first wipe the standard hardness sheet, then use the ruby ​​to be tested (original stone or honed finished product can be) to score a standard piece with a hardness of 8, if not scratched (gems ​​on the hardness standard sheet) There is a feeling of slipping), which means that this "ruby" must be fake. Valuable Burmese jade, as for what it is, still needs further identification. It can be used to scribe a standard piece with a hardness of 6. If it is still scratched, it indicates that its hardness is less than 6. According to the relevant data, there is only one type of hardness below 6, that is, the hardness is 5.5~6. Red glass. If the ruby ​​to be tested is on a standard sheet with a hardness of 8, it is easy to draw a scratch that can't be wiped off (viewable with a magnifying glass), that is a real ruby.