Tenant chipped range porcelain. What is the appropiate deduction

[James Barnhart]

A tenant is moving out tomorrow.  I just noticed that she chipped a big piece from the top front of the porcelain gas range, apparently with her large cast iron skillet.  

We bought that like new range recently from a used appliance center for $250.  What do you think would be the appropiate deduction from her security deposit?  

I can touch it up, but it will still look touched up.  

What do you suggest?