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Julian King, Sotheby's international specialist and head of sale, Himalayan Art, New York told the BBC the auction house had made a thorough review of the jewels.

Himalayan rivers like the Indus carry high silt levels, which quickly accumulate in dams and barrages.

Tuesday's attack saw a group of gunmen fire on tourists near Pahalgam, a resort in the disputed Himalayan region.

Tuesday's killing of tourists gathered at a Himalayan beauty spot in Pahalgam was one of the deadliest incidents in Indian-administered Kashmir in recent years.

The Himalayan region was divided following India's independence from Britain, partition and creation of Pakistan in 1947.