"A RELIQUARY VOTIVE CROWN, TRADITIONALLY CONSIDERED ONE OF THE OLDEST ROYAL INSIGNIA OF CHRISTENDOM. IT WAS MADE IN THE MIDDLE AGES..."
PICS INFO: Spotlight on the Iron Crown of the Lombards, photographed in the Theodelinda Chapel of the cathedral of Monza, Italy, c. August 2008. 📸: James Steakley.
PIC #2: Another shot of the Iron Crown of Lombardy, Monza, Italy, published December 9, 2008. 📸: FilWriter (Italian and Catholic historian/photographer).
EXTRA INFO: The gems in the crown are seven red garnets, seven blue corundums (sapphires), four violet amethysts, and four gems made of glass.
PIC #3: Spotlight on a colored and gilded etching print and stipple engraving of La Couronne de Fer des rois lombards, artwork by Napoleone Zucoli Domenico Landini (1783–1835), c. 1805, now housed in the Bibliothèque nationale de France. Given to the Bibliothèque nationale de France, by Baron Carl de Vinck de Deux Orp (1859-1931).
Sources: https://commons.wikimedia.org/wiki/File:Iron_Crown.JPG#mw-jump-to-license