The phrase "diamond hard" is a correct and usable part of written English.
It is an idiom that means something is very strong or durable. For example, you could say, "The armor of the castle walls was diamond hard, and no enemy could penetrate them."
From the rarefied world of a musical explorer: pieces diamond hard and shining with reflective light.
But when Hector finally encounters the adult June, we're offered yet more admiration of her "diamond hard" temperament.
On this last point James was diamond hard, and pledged a sum toward the purchase of a Breeley house.
The ethereal, yet diamond hard, tone of Sakharov's humanity and thinking is most precisely and movingly located in his 1968 essay, "Reflections on Progress, Peaceful Coexistence, and Peace".
The causal effect of a drought... was frighteningly strong: "a 5-percentage-point negative growth shock... increases the likelihood of civil war the following year by nearly one-half".For more on the subject see this week's Correspondent's Diary on Economist.com, where The Economist's East Africa correspondent writes of climate change:A soft issue, an incremental, becomes diamond hard.
Chief among these, as Jonathan Lethem put it, in a short story inspired by the character, from 2004, is "the power to vary the density of his body, becoming a ghost if he wished to float through walls or doors, becoming diamond hard if he wished to stop bullets like Superman".
Morgan played ball--decent outfielder on the diamond, hard-working guard on the gridiron--until high school.
And Dick Cheney happens to be its diamond-hard distillation.
But without it, Aronofsky's film is chilling, and diamond-hard.
The Graff family empire, flawless or not, seems to be diamond-hard.
The first seven chapters are, like virtually everything he wrote over his long, distinguished career, diamond-hard and brilliant.
