The Quest For A Cursed Diamond.

Shah Jahan built a special throne for himself. It took a craftsman named Syed Geelani and his team of artisans took some seven years to build this throne. Several kilos of gold was overlaid on this throne, it was decorated with many gems.

Jewelers from all over the world used to come to see this throne.

One of these was the Hortenso Borgia of the city of Venice. 

Emperor Aurangzeb gave it to Borgia to enhance the luster of the diamond. 

Borgia acted so clumsily that he broke the diamond piece by piece. 

It was reduced to just 186 carats instead of 793 carats... Aurangzeb had in fact given the task of carving a diamond from a piece of Kohinoor to Borgia secretly and part of the same Kohinoor was mounted in the wall of Shah Jahan's prison, with the help of which he used to see the Taj Mahal and his beloved wife's soul.