The Vasa Diamond Tiara, Princess Märtha of Sweden (below) was offered by the City of Stockholm on the occasion of her marriage to Olav, Crown Prince of Norway in 1929. Now owned by Princess Astrid of Norway (center). designed by Mr. Sven Carlman and made by O. F. Carlman, in the Art Deco style, set with 986 diamonds weighing 49.5 karats, in platinum. The Diadem pattern represents the crest, was inspired by the sheaf of wheat of the Vasa family that ruled Sweden from 1523 to 1654.
From the ever-brilliant Ursual of Royal Magazin, a gorgeous Cartier Garland-style tiara, seen her worn by Princess Anita of Honeberg. more info here. http://www.royal-magazin.de/austria/austria-hohenberg-harambure.htm