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 – forcibly – 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 rectangularshaped diamond of 36 carats.