Question

Should a finger nail be able to scratch the diamond

Answer 1

Explanation:

Soft - can be scratched by a fingernail, Mohs' 1-2; Medium - can be scratched by a knife or nail, Mohs' 3-5; ... Diamond is the hardest known mineral,: It must be noted that Mohs' scale is arbitrary and non-linear, i.e. the steps between relative hardness values are not necessarily equal.

Answer 2

Explanation:

Soft - can be scratched by a fingernail, Mohs' 1-2; Medium - can be scratched by a knife or nail, Mohs' 3-5; Hard - cannot be scratched by a knife but can scratch glass, Mohs' 6-9; Diamond is the hardest known mineral, Mohs' 10

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