One of the largest cut diamonds in the world, the Koh-i-Noor sits at the top of the velvet-and-platinum crown of the Queen of England and was handed over to Queen Victoria after the British annexation of India in 1849.
The stone resides in the British Museum and was originally taken from Egypt by Napoleon Bonaparte. However, the British took the Rosetta Stone after they defeated the French in 1815.
We all have heard the story of Tipu Sultan's wooden tiger but it was taken by the East India Company. Tiger was the main symbol in Tipu's rule, it was incorporated into his throne, weapons, soldier and on palace decorations.
Representing the celebration of the goddess Athena and centaurs and Lapith engaged in a battle, the Parthenon Marbles were taken from the Parthenon in Greece between 1801 and 1805. The British Museum refused to return the marble calling it a "creative act."
After the Mysore ruler Tipu Sultan lost a battle in 1799 against the British, they took away his ring. It has not been returned yet but was auctioned in 2014.