Who is the person who wrote the stone cutters
And nothing stay gold!
And what have this two authors have studied?

These two poems?

To The Stone-Cutters by Robinson Jeffers

Stone-cutters fighting time with marble, you foredefeated
Challengers of oblivion
Eat cynical earnings, knowing rock splits, records fall down,
The square-limbed Roman letters
Scale in the thaws, wear in the rain. The poet as well
Builds his monument mockingly;
For man will be blotted out, the blithe earth die, the brave sun
Die blind and blacken to the heart:
Yet stones have stood for a thousand years, and pained thoughts found
The honey of peace in old poems.

Nothing Gold Can Stay by Robert Frost

Nature's first green is gold,
Her hardest hue to hold.
Her early leaf's a flower;
But only so an hour.
Then leaf subsides to leaf,
So Eden sank to grief,
So dawn goes down to day
Nothing gold can stay.