The Diamond Queen is a BBC documentary series, presented by Andrew Marr, which looks at the life of Queen Elizabeth II. The series focuses on her accession, her daily routine, how she is seen as a role model, and how she coped in her 60th year as monarch. The programme features archive footage of the Queen, as well as in-depth footage of her major engagements since the beginning of 2010 to late 2011.

In the second episode, Marr assesses the Queen's attempts to modernise the monarchy, including the Wedding of Prince William and Catherine Middleton. Princes William and Harry are interviewed about their grandmother's influence on the day. The challenges faced by the monarchy are also reviewed, such as the 1992 'annus horribilis". Marr follows the Queen on her visit to the Republic of Ireland in 2011, and remembers the happy times she enjoyed on the Royal Yacht Britannia, before - to her visual sadness - it was decommissioned in 1997 by Tony Blair.