Koh-i-Noor

Etymology
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Proper noun

 * 1) One of the largest cut diamonds in the world, originating from India and weighing 105.6 carats (21.12 g). It changed hands between various factions in south and west Asia until being ceded to Queen Victoria after the British annexation of the Punjab in 1849.

Noun

 * 1)  Any very large and valuable diamond.