I would definatly take that to rolex in london....dont waste your time taking it back to goldsmiths as it will take 10 times longer to sort out.
Ive always been really impressed with the customer service in london.
The reason i wouldnt accept this problem is ,for me ,its one of the give aways on a fake rolex...
I know you want reasurance its normal but youll be glad to get it back new crystal and all.....not nice to be without the watch for 2 weeks but once you get it back youll soon forget the pain.
Good luck with it