Although they don't look remotely similar, it reminds me of Camilla, Warrior Duchess' ruby breastplate worn in Philadelphia.
--Previous Message-- : It seems that the Duchess of Cambridge is : wearing a very large diamond necklace : tonight! Unfortunately there are not better : pics for the moment! : : https://twitter.com/SPerryPeoplemag/status/408677748521988096/photo/1/large :