Emerald Art Deco Tiara featuring a large central cabochon emerald and diamonds set in platinum, made by Chaumet in 1926. A few old pieces of jewelry, such as a necklace, some earrings, a brooch and other pieces including a large egg shaped emerald and large diamond were sent from Luxembourg to the Paris headquarters of the jeweler to make the tiara. http://lux-arazzi.blogspot.de/2013/08/luxarazzi-101-emerald-art-deco-tiara.html
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Emeralds of Empress Ekaterina II of Russia. C. 1830. Gold, silver, emeralds, diamonds. Set consisting of an emerald and diamond necklace with matching earrings. Every generation of the family of the Marquis of Lothian has believed that the majority of these emeralds were given by the Empress Ekaterina II to their ancestor, the Earl of Buckinghamshire during his embassy to St. Petersburg 1762-1765.
A much later art deco tiara, 1947, by Boucheron. This piece doubles as a necklace once it's taken off its frame
Chaumet Pearl and Diamond Tiara owned by the Countess of Paris
A diamond belle epoque tiara, circa 1900. Formed by two olive branches, with circular diamonds as fruits, in a wreath formation, on a raised band of diamonds. Possibly now part of the Albion Art collection in Japan.
The Bourbon Parme Tiara: Created in 1919 by Joseph Chaumet of diamonds set in platinum.