Grand Duchess Vladimir Tiara
Owned by Grand Duchess Maria Pavlovna (aka Grand Duchess Vladimir) until her death in 1920, the tiara was sold by her daughter Princess Nicholas of Greece to Queen Mary. Mary wore it for several portraits before dying in 1953 and passing it onto Queen Elizabeth II.
The tiara has three settings: Emeralds, Pearls, or none at all. Elizabeth has worn all three settings on many occasions in her long reign.