Hans, that's Josephine-Charlotte Van Cleef and Arpels emerald and diamond convertible tiara/necklace.
--Previous Message-- : During the weddingball of Hereditary : Grand-Duke Guillaume & Countess : Stéphanie, the aunt of the groom, : Archduchess Marie-Astrid of Austria wore the : emerald peacock tiara. : : I found on this board a wonderfull close-up, : posted by Gert-Jan. I find it quite strange : that the size of the emeralds, and maybe : also the cut, is different. : : : : The 2 emeralds placed above are round and : much bigger. I would have chosen emeralds : with the same size/cut. : : : :