The correct answer is Decorating the walls with floral designs made of semi-precious stones.
Key Points
- Pietre dura is Italian plural meaning hardstones or hard rocks.
- Pietra dura is also known as Parchin Kari or Parchin Kari.
- The term was used for the inlay technique of using cut and fitted, highly polished colored stones to create images.
- It is considered decorative art.
- The Pietre dure art got its most popularizing time during Shahjahan's reign.
- Shahjahan used poietre dure tehcnique of arhitechture in Taj Mahal.



