"Just because you dig up your dead grandmother put a couple of bullets in her and post her bullet ridden corpse on a forum as proof I killed her does not mean that's what happened.
Some conditions do apply to "evidence"
this is the best analogy ive heard from a ceo in a while.
If the diamonds arent pulverized fine enough, its really as simple as the Mohs scale. Perhaps he had a bad batch. But dang, fix the damages admit the bad batch remove the bad batch and move on, problem solved.