Blue Eyris Pearls - Pearls from the sea creatures known as abalone are incredibly rare. They cannot be cultured like the pearls from mussels and oyster; abalone are all hemophiliacs. They bleed to death when injected with a nucleus.
Princess Diana, shortly before she died - wearing a dazzling blue azagury dress to the English National Ballet at the Royal Albert Hall. She is wearing the 'Swan Lake necklace' from Gerrads, made from diamonds and south sea pearls.