The correct answer is Coloured, hard stones placed in depressions carved into marble or sandstone creating beautiful, ornate patterns.

• Pietra dura is a floral design made up of semiprecious stone.
  • One of the most significant, captivating, and impressive characteristics of Mughal Art and Architecture in India is the Art of Pietra Dura.
  • This involves and inlay work of delicately cut, fitted, and highly polished semiprecious stones like Lapislazuli, Agate, Jasper, Jade, etc..
  • It is the technique of inlaying semi-precious stones such as jade, onyx, turquoise, mother of pearl, etc. in marble or sandstone creating beautiful, ornate patterns.
  • It is also called as called Parchin kari or Parchinkari.
  • Pietra Dura is an ancient art form that blossomed in Italy and eventually spread across Europe, Russia, Afghanistan, India, and Pakistan.​

• The tomb of Itimad- ud -Daulah is often regarded as a draft of the Taj Mahal. 
• It was built by the Mughal queen Noor Jahan, wife of Emperor Jehangir.
• It is known for the first use of the pietra dura.
• Jahangir's reign is known for the adoption of the pietra dura work.
• Shah Jahan used Pietra dura in the construction of the Taj Mahal as well.