Explanation:

2nd option is correct.
Pietra Dura work is an unique tradition of art, introduced in architecture by Islamic dynasties.
Pietra dura or pietre dure, called parchin kari or parchinkari in South Asia, is a term for the inlay technique of using cut and fitted, highly polished colored stones to create images. It is considered a decorative art. The stonework, after the work is assembled loosely, is glued stone-by-stone to a substrate after having previously been "sliced and cut in different shape sections; and then assembled together so precisely that the contact between each section was practically invisible".