The Chinese Chop

As hard as stone,
But smaller than your phone.
As old as age,
You will find it's used on a page.
It was used so long ago it is filled with old magic,
But it isn’t that tragic.
Dip it in bold red ink,
It will work better than you think.
It is used to sign your name,
Each one different and rarely the same.
All from one old Chinese chop,
And with a red cherry on top.