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The Great Imperial Crown, made in 1762 for the coronation of Catherine the Great. It is adorned with five thousand diamonds arranged in a splendid pattern of laurel wreaths and oak branches. The glitter of the diamonds is enhanced by two rows of gleaming pearls and the crown is topped by a huge red spinel, the second largest in the world, which weighs almost 400 carats.

Emerald and black gold tiara. Designed by Solange Azaguri-Partdrige for Boucheron. Queen Rania of Jordan. (It looks striking on )

Denmark's Diamond Floral Aigrette Tiara is comprised of 3 pieces and mounted en trenblant.

folding gold crown from one of the six graves of Bactrian nomads discovered at Tillya Tepe in northern Afghanistan in 1978. The crown, dating from the first century A.D. and wrought of solid gold, was collapsible for easy transport by the ancient nomads.

DIY Medusa headpiece. Instructions from poster: They bought cheap plastic snakes at the $1 store (a few dozen in a pack), wire, a double banded headband, and a can of gold spray paint. They wired the snakes into a great little tiara and then sprayed the whole thing gold.

Brazilian Aquamarine Tiara owned by Queen Elizabeth

circa 1900 Tiffany & Co. platinum and diamond ring with a modified marquise-shaped diamond of fancy blue color weighing 3.54 carats

Pink pearl and pink diamonds

The Earth Star Diamond: The Earth Star was cut from a rough gem weighing 248.9 carats found in the Jagersfontein Mine on May 16th, 1967. It travelled right through the recovery process until it appeared on the grease table in the recovery plant. Not surprisingly its appearance caused a commotion at the mine and to many in the diamond industry because too among the numerous fine diamonds found at Jagersfontein, there had been few brown gems.