Kohinoor Diamond was in possession of various rulers, it came into possession of Kakatiyas, Alauddin Khilji, Babur, Shah Jahan, Nadir Shah, Ahmad Shah Durrani (Founder of Afghan empire), Maharaja Ranjit Singh and finally, it passed into the hands of British Monarch.
Kohinoor diamond is valued at around ₹1.64 lakh crore, which is more than the GDP of many countries. 
Explanation
The Kohinoor diamond is the world’s most expensive diamond. 
The diamond’s value is due to its size, weight, brilliance, and uniqueness. 
The Kohinoor’s name comes from the Persian word “Kohinoor” which means “Mountain of Light”. 
The Kohinoor was originally mined in the Golconda region of India. 

The diamond was given to Queen Victoria after the British annexed Punjab in 1849. 
The Kohinoor was later set into the crown of Queen Elizabeth, the consort of King George VI. 

The Kohinoor is currently on display in the Jewel House at the Tower of London. 
Other details about the Kohinoor diamond: 
The Kohinoor has a bloody history.
The diamond has changed hands several times over the centuries.
The diamond has been claimed by India, Pakistan, Iran, and Afghanistan.
Koh-e-Noor, Kohinoor and Koh-i-Nur, is one of the largest cut diamonds in the world, weighing 105.6 carats