Greek Emerald Tiara
This particular tiara has gone through several forms. It began with Grand Duchess Olga of Russia, who married King George I of Greece in 1867. When she moved to Greece, she took a set of emeralds with her. She used the emeralds as separate pieces, simply pinning them to her dress and kokoshink.
After Olga’s death in 1926, the emeralds went to her grandson, King George II. George’s wife Elisabeth took control and began using the emeralds in a tiara. She first wore a single emerald in a bandeau across her forehead, as was typical of the time. Later, Cartier made the a kokoshnik style tiara with several of the emeralds.
Frederika, wife of King Paul I, had aspects of the tiara removed, creating the tiara we know today. Frederika wore it as Queen, but passed it onto Princess Anne-Marie of Denmark in 1964 when Anne-Marie married Frederika’s only son, King Constantine II. Anne-Marie has worn it quite often since becoming Queen of Greece.
(Thank you to Royal Order of Sartorial Splendor for this detailed info.)