The Banjarmasin Diamond, anonymous, c. 1875
This diamond once hung on a chain around the neck of Sultan Panembahan Adam van Banjarmasin (South Borneo). After problems arose in the succession, the Netherlands decided in 1859 to seize control of the sultanate of Banjarmasin. The diamond was declared Dutch state property. In Amsterdam the 70-carat rough diamond was later cut into a rectangular-shaped diamond of 36 carats.