Cartier diamond and pearl tiara. The tiara is composed of swirls of diamonds surrounding eight large pearls. This gem belonged to Queen Victoria Eugenia, born a princess of Battenberg. One of the many grandchildren of Queen Victoria, she married King Alfonso XIII of Spain in 1906.
The tiara is most likely from 1825, when it was donated to Princess Louise of the Netherlands, the Queen's great-grandmother. The tiara is part of a set, considered to be among the most prestigious pices of jewelry in the Danish royal family's possession.