Grand Duchess Vladimir Tiara
The Grand Duchess Vladimir tiara was originally owned by the Grand Duchess Elena Valdimirovna, who snuck it out of Russia during the revolution. She sold it to Queen Mary in 1921, and it is now worth $470,000.
Mouawad Ruby & Diamond Necklace
While not much is known about the Mouawad Ruby and Diamond necklace, it was seen being worn by Kate Middleton in 2016. She is said to have received the necklace, along with its matching earrings and bracelet, as a gift in honor of her wedding in 2011. It is valued at $300,000.