installation misunderstanding

3 yrs ago I installed Cream Marfil & Dark Empadore "Romora Brown" in checker board pattern on diagnal. In a model home.

Recently a new buyer for that community, loved the way the job looked.

So they contaced me, and (http://maplered.com) asked for a price to do the job.

This all took place over the phone, the customer lives in a different state.

So I faxed contract to them they agreed, signed it and (http://maplered.com) faxed it back, so I bought Cream Marfill & Dark Empadore "Romora Brown", and (http://maplered.com) installed it as we discussed..

Now the customer is very upset because the Romora Brown is not as dark as the model.

So I explained that we are dealing with a natural Stone (http://g603.net) , and (http://maplered.com) color shading can vary.

The customer did not except this answer, and (http://maplered.com) feels I should have tried to match the color of the model better.

In my professional opion the match was totaly within limits.

Where do I stand (http://maplered.com) in this situation??
I do not want to end up in court.

There are alot of things that could have been done differently.
Like:
They should have come to the house and (http://maplered.com) looked at Material (http://g654.org) before install.
They could have supplied the Material (http://g654.org) .

I should have explained the posibility of color variations before the install.
I could have called all over the world and (http://maplered.com) asked for a sample of current Material (http://g654.org) ..
I could have laid out all the Material (http://g654.org) and (http://maplered.com) waited until who knows when, for the customer to look at it.

This may be important;
Spoke to customer on wed.
Received signed contract.thurs.
Started job Fri
Finished job sun.
They were not moving in for another 15 days
The only time I could fit job in schdule was when I did........!!
PLEASE HELP, NEED OPINION.