"But that does not make themselves Justified categorically"

Diamonds are the hardest objects found naturaly. While everything around them was crushed and changed ober the eons - they persisted. And if polished they shined. And can cut any other known material.

It makes for a good story, which is why humans are after them, since a long time. Kings and queens wore them. Pirates stole and buried them.

Is the story justified categorically? I don't know, but it is an old story.

But personally I rather would like to have the sci-fi story, where diamonds are cheaply avaiable, as a very strong building material..