The necklace's name carries a deeply significant meaning with Diana wearing the piece out in public only once, and it was to attend a performance of Swan Lake at London's Royal Albert Hall.

A stunning and magical production of Tchaikovsky's Swan Lake on a grand scale, filmed in front of a packed audience at the Royal Albert Hall. With more than 100 dancers, this breathtaking in-the ...

Tue 24 Dec, BBC2 22:15 At lunchtime on Christmas Day, you can catch a recording of Tchaikovsky's "Swan Lake", performed at the Royal Albert Hall in June by the English National Ballet ...