Editing Diamond (section)

==== Toughness ====
Somewhat related to hardness is another mechanical property ''toughness'', which is a material's ability to resist breakage from forceful impact. The [[toughness]] of natural diamond has been measured as 50–65&nbsp;[[Megapascal|MPa]]·m<sup>1/2</sup>.{{contradiction inline|reason=Unit of toughness as given at the article on toughness is newton-metres per cubic metre, dimensionally equivalent to newtons per square metre i.e. pascals. What is this factor of m^{1/2} doing here? Should we actually be talking about and linking to [[Fracture toughness]] (which unfortunately doesn't have a discussion of units)?|date=October 2023}}<ref>{{cite book| vauthors = Lee J, Novikov NV |title=Innovative superhard materials and sustainable coatings for advanced manufacturing|url=https://books.google.com/books?id=EXGcDYj8HvEC&pg=PA102|page=102|publisher=Springer|year=2005|isbn=978-0-8493-3512-9}}</ref><ref>{{cite book| vauthors = Marinescu ID, Tönshoff HK, Inasaki I |title=Handbook of ceramic grinding and polishing|url=https://books.google.com/books?id=QCvqtRJJ4XwC&pg=PA21|page=21|publisher=William Andrew|year=2000|isbn=978-0-8155-1424-4}}</ref> This value is good compared to other ceramic materials, but poor compared to most engineering materials such as engineering alloys, which typically exhibit toughness over 80{{nbsp}}MPa·m<sup>1/2</sup>. As with any material, the macroscopic geometry of a diamond contributes to its resistance to breakage. Diamond has a [[cleavage plane]] and is therefore more fragile in some orientations than others. [[Diamond cutting|Diamond cutters]] use this attribute to cleave some stones before faceting them.<ref name=harlow/> "Impact toughness" is one of the main indexes to measure the quality of synthetic industrial diamonds.