According to [this paper][1] if diamonds are doped with some boron and nitrogen it will gain enormous toughness while retaining the superhardness characteristic of diamonds. 

This diamonds reach toughness of 34 MPa√m !! This value is about 10 times tougher than most ceramics and approaching the realm of aluminum alloys. 

Assuming we are able to produce such diamonds in the bulk with low cost , how would these diamonds perform as an armor ? 

How would this material be in comparison to armor steels like AR500 & AR600  agains armor-piercing bullets ?

**Note: this not duplicate , old questions did not mentioned super tough diamonds.**


 


  [1]: https://www.researchgate.net/publication/51562529_Enhancing_the_mechanical_properties_of_single-crystal_CVD_diamond