Great Pearl Secret

It is the afternoon before a grand society wedding between Juliet Phayre and the Duke of Claremanagh, when Emmy West drops by to visit the bride and to see the famed Tsarina pearls, only ever to be worn by the Duchess... supposedly. When Juliet admits she has never even seen them, Emmy lets slip she has once, even though the last duchess has been dead many years... were they worn by someone else? And who is Lyda Pavoya? And who is the bridegroom really?