Some diamonds are harder than others?

[kenny]

This source says diamonds from Argyle mine in Australia are harder.
Can this be true?

Snip:

Argyle diamonds have two very unique and outstanding features: they are harder than other diamonds and may fluoresce blue under ultra-violet light.

The hardness factor of Argyle diamonds results from its unusual atomic structure.
Although all diamonds share the same atomic structure, the atoms of Argyle diamonds are bonded together in more complex arrangements.
This complex structure is also one of more the major reasons for the deep colours of the Argyle product mix, especially the champagne and pink diamonds.

Source

 

[stone-cold11]

Huh? I thought the Argyl pinks were known to shatter easier because of the stress planes that produce the pink coloration?

 

[kenny]

SC-11, lets not forget that diamonds are hard but can chip and shatter.

So ability to shatter does not mean something is not hard; it may indicate it IS hard.