Nizam Diamond

Nizam Diamond is believed to have been the most famous diamond in the 1800s. It is named after its original owner Mir Osman Ali Khan, the last Nizam of Hyderabad. There are tales about its size, around . The story goes back to the rulers of Golconda, and is believed to have been found at Kollur Mine.
There have been no records of any international auction. Nizam diamond, known as little Kohinoor, was mined from Krishna river. Kollur diamond mine, is now submerged under water of Pulichintala dam. Nizam diamond was mined in year 1830 and went missing after Police Action in year 1948. 
As per state archival data, Nizam diamond was present in 1944 and India office in London had sought its details. This had angered the Nizam and he refused to divulge details about the Nizam or Golconda diamond and other precious stones and gems in his possession.