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The Diamond Shah is 90 carat (18 g), 3 cm long, yellow diamond, extremely clear. This diamond was found in Central India, probably in 1450.
It was rendered to the shah court in Ahmadnagar. In 1591 Shah Nizam ordered carving on one of the facets of the diamond: "Burhan-Nizam-Shah Second. Year 1000".
In the same 1591 the ruler of the Northern India, the Great Moghul Akbar occupied Ahmadnagar and seized the diamond. After Akbar's grandson, Shah Jehan (trans. "the ruler of the world") came to the throne of Great Moghuls, he commanded to carve another inscription: "The son of Jehangir-Shah Jehan-Shah. Year 1051". By the modern calendar it was 1641. The son of Jehan-shah Aureng-Zeb hung the diamond above his throne and encircled it with rubies and emeralds. Till 1738 the diamond Shah was kept in Delhi.
In 1738 Nadir Shah attacked India, seized the diamond and took it to Persia. In 1824 the third inscription appeared on the third facet: "The ruler of the Kadgar-Fath ali-shah Sultan. Year 1242".
In 1829 Russian diplomat and writer Griboedov Alexander Sergeevich was murdered in the capital of Persia, Tehran. The Russian government demanded severe punishments of those responsible. In fear, the Shah's court had sent the Shah's son Hosrov-Mirza to Peterburg, where he gave the Shah diamond to the Russian Tsar as a present. Thus the Shah diamond came to the Russian Diamond Fund.
It remains there at the Kremlin.

You can see the image of the Diamond Shah: [1]