Inscribed with the name Nur Jahan, the wife of the Mughal Emperor Shah Jahangir, this heart-shaped diamond is believed to have been a gift from the ruler to his son, who became the great emperor Shah Jahan (1592-1666).

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Sevantilal Shah, the boss of Venus Jewel, a big diamond polisher and producer in Surat, says domestic sales are flourishing.

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Two key players, director Nadeem Rizvi and Bharat Shah , a film producer and one of India's leading diamond merchants, have been charged so far.

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