Cullinan V Heart Brooch. The brooch was designed and created by Garrard's. It is described as an 18.8 carat heart-shaped diamond set in the center of a platinum brooch. Surrounded by paveé diamond scrolls and leaves, platinum rays and diamond collets of varying sizes. In early May 2023 the brooch was set in the center of the Queen Mary's 1911 Crown to be used in the coronation of HM Queen Camilla, consort of HM King Charles III.