The Henckel von Donnersmarck Tiara

This tiara, valued at US$12.7 million, was crafted by the House of Henckel in 1900. 

It features diamonds, sapphires, and other gemstones and has had several owners over the last century. Originally, the Henckel von Donnersmarck Tiara had a pink diamond attached to it, one of its most remarkable features. 

Over the years, the tiara has undergone alterations to its design. Currently, the tiara is privately owned.