Nowadays marble mostly are COATED. Means it can easily tear off and looks so ugly after then.

You have to be careful cuz the salesperson surely can easily bluff you on this. Had an experienced for my new house, the girl said its 100% marble but end up got slightly defect just right the corner of the table.
Immediately i cancel and return back to shop.

Pic as below:
http://img850.imageshack.us/img850/4076/imag1236.jpg


Till now still haven't buy my dining. To be honest i'm still in shock tho.
For me, i wont ever buy a marble dining again.