I have checked wikipedia just to confirm that ur bull shiting manoj. Kohinoor never came from Iran.
This is waht wikipedia says "Historical evidence suggests that the Kohinoor originated in the Golconda kingdom, in the Hyderabad state of Andhra Pradesh, one of the world's earliest diamond producing regions. This region was the first and only known source for diamonds until 1730 C.E. when diamonds were discovered in Brazil. The term "Golconda" diamond has come to define diamonds of the finest white color, clarity and transparency[3]. They are very rare and highly sought after."