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Most of the famous large diamonds of the world have come from India, their origin being usually traceable to a period between the thirteenth and eighteenth centuries. Some of the best known of these are the Kohinoor, Pitt, Orloff, Great Mogul, Florentine, and Sancy.
The Kohinoor first appeared in history in the year 1304. It was at that time mentioned as acquired by the Sultan Alaeddin from the Rajah of Malwa, in whose family it had long been held as an heir­loom. It was later restored to the Rajah of Gwalior; but on the defeat of this official, in 1526, by Humairen, emperor of Hindostan, the stone was presented to the latter by some of the former's adherents. Sul­tan Baber states that at this time the diamond was valued at " half the daily expense of the whole world." The stone remained in the posses­sion of the Mogul dynasty until the invasion of India in 1739 by Nadir Shah, the Persian conqueror. The reputed exclamation of the latter when he first saw the stone, "Koh-i-Nur!" ("Mountain of Light!") gave it the name by which it has since been known. As the reward of an alliance the diamond was given by the son of Nadir to Ahmed Shah, founder of the Durain Afghan empire, in 1751. A successor of the latter sought to conceal the stone from a usurper by embedding it in the plaster of his cell, but after lying hidden in this way for many years it became exposed and was once more restored to the Afghan crown. An Indian prince, Runjit Singh, later obtained the diamond by conquest and brought it to Lahore where it remained until English rule was established. In 1850 it was sent to England in charge of two officers. It weighed at that time 186-1/16 carats. It had not a symmetrical shape, its cutting being con­fined, after the usual manner of Indian lapidaries, to fashioning rude facets on the surface. It also contained two or three flaws. In order to remove these, and give it a symmetrical shape, the stone was cut in London, in 1852, by Messrs. Coster, of Amsterdam, to the form of a brilliant. About 80 carats were sacrificed in this process, and the stone at present has a weight of 106 carats. The quality of the Kohinoor is not the finest, it having a slight grayish tinge; but on account of its romantic history it is one of the most famous, if not the most famous, of diamonds.
The diamond known as the "Regent" or "Pitt" was found in India in 1701 by a slave, who to conceal it, cut his leg that he might put it in the bandage thus made necessary. He thus escaped with it to the coast, and offered the stone to an English skipper as payment for passage to a free country. The latter on receiving the diamond threw the slave into the sea. He then sold the gem to a dia-
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