The Cullinan III and IV - aka The Cullinan Brooch

The third and fourth stones cut from the Cullinan diamond were fondly known as ‘Granny’s Chips’. Granny was Queen Mary, queen consort to George V and the grandmother of HM Queen Elizabeth II. She had the Cullinan III and IV set into the finial and band of her crown temporarily, for her husband's coronation on June 22, 1911.

Queen Mary's coronation Crown

These two stones could be removed from the crown and worn in unison as a brooch with the 63.6 carat, cushion cut Cullinan IV on the top and the 94.4 carat, pear shape Cullinan III on the bottom. Queen Mary wore this brooch quite often and usually to important functions, including the marriage of her granddaughter Princess Elizabeth in 1947. This brooch is now part of the personal jewellery collection of HM Queen Elizabeth and is not part of the Crown Jewels. Due to the weight of the stones when worn in the brooch style, it is not worn very often.

The current value of this pair of diamonds is £ 50,000,000 or $100,000,000.