With compounds extracted from across the Commonwealth, a unique scent has been created especially for the Queen to mark her diamond jubilee.
The Queen's Baton Relay is a unique tour of the Commonwealth and has happened in some form since the 1958 British Empire and Commonwealth Games.
But for those of us who believe in the Commonwealth as a unique international experiment in promoting shared values around democracy, development and human rights, the celebrations have been bittersweet.
Unique at the time among Commonwealth forces, the uniform was changed to an all-purpose middle blue suit in 1972 but following numerous complaints in the ensuing years reverted to Williams' original colour and style in 2000.
Through the Commonwealth, we have a unique opportunity to share knowledge and understanding of the causes of child marriage, and more importantly what works to end it.
The name for its unique status in U.S. law is "commonwealth".
This unique arrangement continued following the advent of Commonwealth Prime Ministers' Conferences in 1944.
But will Le Cheminant carry on until Gold Coast 2018 and therby complete a unique double of two Australian and two Scottish Commonwealth Games three decades apart?
The commonwealth prosecutor, Kathy Piechutowska, said the case was unique, as the offences Sant faces had never been tried before.
Adams was the first woman to win Olympic and Commonwealth boxing gold medals and hopes to complete a unique treble in Baku.
