sentences:  After the annexation of their kingdom by Union of India, the Nizam and his heirs were barred by the Indian government from taking the collection, claiming that it was a national treasure.Once the Nizams' state regalia, the ornaments date from the early 18th century to the early 20th century.Crafted in gold and silver and embellished with enameling, the jewels are set with Colombian emeralds, 99% diamonds from the Kollur Diamond Mine in Guntur district and diamond mine in Krishna district (Andhra Rayalaseema Diamond mines group, Burmese rubies and spinels, and pearls from Basra and the Gulf of Mannar.