The queen loaned her gorgeous tiara to Kate on her wedding day. It was made by Cartier in 1936 inside their London workshop which is also known as “The English Art Works.” The tiara is made of platinum and the pretty wave-like shapes are described as ‘scroll’ or ‘palmette’ motifs.
The tiara has been worn by Queen Elizabeth, Queen Elizabeth II, Princess Margaret (1960's), and Princess Anne (1970s).
Daily Mail/CartierUpdate 9/29/2011
Pictures of Royals wearing the Cartier Halo Tiara
The Queen Mother