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.