Rolex Watch Service... How much?

[XTO]

My watch is a Rolex Oyster Perpetual Date-just. Just got it from a friend last weekend.

How much do you usually pay for the service(maintenance)? What do they do to your watch? Would the watch look brand new after the service? If I want to replace the Sapphire Crystal(with a deep scratch), any idea how much?

You can bring it to any Washington Jewerly Emporium. Ours were
serviced (cleaning, buffing etc.) at SM North Edsa branch. Cost varries
on the works to be done.

Sapphire glass? I thought it is scratch proof?