Here's a list of some of the tiaras in the jewel collections of the current reigning families of Europe. Some have appeared on the blog; follow the links from those pieces to read more about their histories.
Belgium
The Art Deco Bandeau Tiara: ca. early 20th century; worn by Queen Paola
The Brabant Laurel Wreath Tiara: Hennel & Sons, ca. 1912; worn by Queen Mathilde
The Brabant Laurel Wreath Tiara: Hennel & Sons, ca. 1912; worn by Queen Mathilde
The Diamond and Pearl Bandeau Tiara: provenance unknown; worn by Princess Claire
The Nine Provinces Tiara: Van Bever, ca. 1926; worn by Queen Mathilde
The Princess Claire Wedding Tiara: provenance unknown; worn by Princess Claire
The Princess Claire Wedding Tiara: provenance unknown; worn by Princess Claire
The Spanish Wedding Gift Tiara: ca. 1960; worn by Queen Fabiola
The Wolfers Tiara: Wolfers, ca. 1960; worn by Queen Fabiola
Denmark
The Baden Palmette Tiara: Koch, ca. 1856; worn by Queen Margrethe II
The Crown Princess Mary Wedding Tiara: provenance unknown; worn by Crown Princess Mary
The Emerald Parure Tiara: C.M. Weisshaupt, ca. 1840; worn by Queen Margrethe II
The Flora Danica Tiara: Flora Danica, ca. 2011; worn by Princess Marie
The Floral Aigrette Tiara: ca. 19th century; worn by Queen Margrethe II
The Golden Poppies Tiara: Arje Griegst, ca. 1976; worn by Queen Margrethe II
The Midnight Tiara: Charlotte Lynggaard, ca. 2009; worn by Crown Princess Mary
The Nassut Tiara: Nicolai Appel, ca. 2012; worn by Queen Margrethe II
The Pearl Poiré Tiara: ca. 1825; worn by Queen Margrethe II
The Ruby Parure Tiara: ca. 19th century; worn by Crown Princess Mary
The Princess Dagmar Floral Tiara: ca. early 20th century; worn by Princess Marie
The Princess Thyra Sapphire Tiara: ca. 19th century; worn by Princess Elisabeth
The Princess Thyra Sapphire Tiara: ca. 19th century; worn by Princess Elisabeth
The Turquoise Daisy Bandeau Tiara: ca. 20th century; worn by Queen Margrethe II
Liechtenstein
The Habsburg Fringe Tiara: Köchert, ca. 1890; worn by Hereditary Princess Sophie
The Kinsky Honeysuckle Tiara: ca. 1870; worn by Princess Tatjana
Luxembourg
The Amethyst and Pearl Bandeau Tiara: provenance unknown; worn by HGD Stéphanie
The Aquamarine Bandeau Tiara: ca. 20th century; worn by GD Maria Teresa
The Belgian Scroll Tiara: Henry Coosemans, ca. 1953; worn by GD Maria Teresa
The Chaumet Emerald Tiara: Chaumet, ca. 20th century; worn by GD Maria Teresa
The Citrine and Pearl Bandeau Tiara: provenance unknown; worn by GD Maria Teresa
The Citrine and Pearl Bandeau Tiara: provenance unknown; worn by GD Maria Teresa
The Congo Diamond Necklace Tiara: Van Cleef & Arpels, ca. 1953; rarely worn
The Emerald Peacock Necklace Tiara: Van Cleef & Arpels, ca. 1956; worn by GD Maria Teresa
The Empire Tiara: ca. 19th century; worn by GD Maria Teresa
The Grand Duchess Marie-Adelaide Tiara: ca. 19th century; worn by GD Maria Teresa
The Luxembourg Vine Tiara: ca. 19th century; worn by GD Maria Teresa
The Luxembourg Vine Tiara: ca. 19th century; worn by GD Maria Teresa
The Pearl and Diamond Choker Tiara: Chaumet; worn by GD Maria Teresa
The Sapphire Art Deco Tiara: provenance unknown; rarely worn
The Sapphire Art Deco Tiara: provenance unknown; rarely worn
The Small Nassau Floral Tiara; provenance unknown; worn by Princess Alexandra
The Turquoise Tiara: ca. 20th century; worn by GD Maria Teresa
The Weiller Art Deco Tiara: ca. 1990s; worn by Princess Sibilla
Monaco
The Bains de Mer Tiara: Cartier, ca. 1956; rarely worn
The Baumer Aigrette Tiara: Lorenz Bäumer, ca. 2011; worn by Princess Charlene
The Cartier Pearl Drop Tiara: Cartier, ca. 1920; worn by Princess Caroline
The Grimaldi Sapphire Necklace Tiara: provenance unknown; worn by Princess Caroline
The Grimaldi Sapphire Necklace Tiara: provenance unknown; worn by Princess Caroline
The Ocean Tiara: Van Cleef & Arpels, ca. 2011; worn by Princess Charlene
The Princess Charlotte Fringe Tiara: provenance unknown; worn by Princess Caroline
The Princess Charlotte Fringe Tiara: provenance unknown; worn by Princess Caroline
The Serre-Chignon Tiara: ca. 1956; rarely worn
The Netherlands
The Antique Pearl Tiara: ca. 1900; worn by Queen Máxima
The Aquamarine Tiara: Van Kempen & Begeer, ca. 1920s; worn by Queen Máxima
The Aquamarine Tiara: Van Kempen & Begeer, ca. 1920s; worn by Queen Máxima
The Diamond Bandeau Tiara: ca. 1937; worn by Queen Máxima
The Diamond Haircomb Tiara: ca. 1910; worn by Queen Máxima
The Diamond Haircomb Tiara: ca. 1910; worn by Queen Máxima
The Diamond Festoon Tiara: ca. 1880s; worn by Queen Máxima
The Ears of Wheat Tiara: ca. 19th century; worn by Princess Margriet
The Emerald Parure Tiara: Schürmann & Co., ca. 1898; worn by Queen Máxima
The Laurel Wreath Tiara: provenance unknown; worn by Princess Laurentien
The Mellerio Ruby Tiara: Mellerio, ca. 1889; worn by Princess Beatrix
The Mellerio Sapphire Tiara: provenance in question, ca. 1881; worn by Queen Máxima
The Pearl Button Tiara: ca. 1965; worn by Princess Beatrix
The Queen Emma Diamond Tiara: Begeer, ca. 1879; worn by Princess Beatrix
The Queen Emma Diamond Star Tiara: tiara ca. 1965, stars ca. 1879; worn by Queen Máxima
The Queen Emma Diamond Tiara: Begeer, ca. 1879; worn by Princess Beatrix
The Queen Emma Diamond Star Tiara: tiara ca. 1965, stars ca. 1879; worn by Queen Máxima
The Ruby Peacock Tiara: Schürmann & Co., ca. 1897; worn by Queen Máxima
The Sapphire Necklace Tiara: Mellerio?/Hoetig, ca. 1881/1902; worn by Princess Margriet
The Stuart Tiara: Schürmann & Co., ca. 1897; rarely worn
The Württemberg Ornate Pearl Tiara: ca. 1897; worn by Princess Beatrix
Norway
The Amethyst Necklace Tiara: ca. 20th century; worn by Crown Princess Mette-Marit
The Diamond Daisy Bandeau Tiara: ca. 1910; worn by Crown Princess Mette-Marit
The Feather Aigrette Tiara: ca. 20th century; worn by Princess Astrid
The Gold Bandeau Tiara: ca. 20th century; worn by Princess Astrid
The King Olav Gift Tiara: ca. 1989; worn by Princess Märtha Louise
The King Olav Gift Tiara: ca. 1989; worn by Princess Märtha Louise
The Maltese Cross Tiara: Garrard, ca. 1910; worn by Queen Sonja
The Modern Gold Tiara: ca. 1997; worn by Queen Sonja
The Norwegian Emerald Parure Tiara: Bapst, ca. 19th century; worn by Queen Sonja
The Norwegian Emerald Parure Tiara: Bapst, ca. 19th century; worn by Queen Sonja
The Queen Josefina Diamond Tiara: ca. 19th century; worn by Queen Sonja
The Queen Maud Diamond Tiara: ca. 1896; rarely worn
The Queen Maud Pearl Tiara: Garrard, ca. 1896/1995; worn by Queen Sonja
The Queen Maud Pearl Tiara: Garrard, ca. 1896/1995; worn by Queen Sonja
The Queen Maud Turquoise Tiara: ca. 1896; worn by Princess Astrid
The Queen Maud Vifte Tiara: ca. 19th century; worn by Queen Sonja
The Queen Maud Vifte Tiara: ca. 19th century; worn by Queen Sonja
The Vasa Tiara: C. F. Carlman, ca. 1929; worn by Princess Astrid
Spain
The Asturias Ansorena Tiara: Ansorena, ca. 2009; worn by the Princess of Asturias
The Cartier Loop Tiara: Cartier, ca. 19th century; worn by Queen Sofia
The Cartier Pearl and Diamond Tiara: Cartier, ca. 20th century; worn by Queen Sofia
The Fleur-de-Lys Tiara: Ansorena, ca. 1906; worn by Queen Sofia
The Marichalar Meander Tiara: provenance unknown; worn by Infanta Elena
The Mellerio Shell Tiara: Mellerio, ca. 1868; worn by Queen Sofia
The Niarchos Ruby Tiara: Van Cleef & Arpels, ca. 1962; worn by Queen Sofia
The Prussian Tiara: Koch, ca. 1913; worn by the Princess of Asturias
The Spanish Floral Tiara: maker uncertain, ca. 1879; worn by the Princess of Asturias
The Spanish Floral Tiara: maker uncertain, ca. 1879; worn by the Princess of Asturias
Sweden
The Aquamarine Bandeau Tiara: ca. 1920s; worn by Princess Madeleine
The Baden Fringe Tiara: ca. 1881; worn by Crown Princess Victoria
The Braganza Tiara: ca. 1820; worn by Queen Silvia
The Cameo Tiara: Nitot, ca. 1809; worn by Queen Silvia
The Connaught Diamond Tiara: E. Wolff & Co., ca. 1904; worn by Princess Madeleine
The Crown Princess Victoria Birthday Tiara: ca. 1995; worn by Crown Princess Victoria
The Crown Princess Victoria Birthday Tiara: ca. 1995; worn by Crown Princess Victoria
The Diamond Bandeau Tiara: provenance unknown; worn by Princess Madeleine
The Diamond Four Button Tiara: buttons ca. 18th century; worn by Princess Madeleine
The Diamond Six Button Tiara: buttons ca. 1818; worn by Crown Princess Victoria
The Diamond Six Button Tiara: buttons ca. 1818; worn by Crown Princess Victoria
The King Edward VII Ruby Tiara: ca. 1905; worn by Queen Silvia
The Laurel Wreath Tiara: Boucheron, ca. 1905; worn by Crown Princess Victoria
The Leuchtenberg Sapphire Tiara: Nitot, ca. 19th century; worn by Queen Silvia
The Modern Fringe Tiara: ca. 1986; worn by Princess Madeleine
The Napoleonic Amethyst Tiara: ca. 19th century; worn by Crown Princess Victoria
The Napoleonic Cut-Steel Tiaras: ca. 19th century; worn by Crown Princess Victoria
The Nine-Prong Tiara: ca. 19th century; worn by Queen Silvia
United Kingdom
The Aquamarine Necklace Tiara: Collins & Sons, ca. 2005; worn by the Countess of Wessex
The Aquamarine Pine Flower Tiara: Cartier, ca. 20th century; worn by Princess Anne
The Boucheron Honeycomb Tiara: Boucheron, ca. 1920s; worn by the Duchess of Cornwall
The Brazilian Aquamarine Tiara: Garrard, ca. 1971; worn by Queen Elizabeth II
The Burmese Ruby Tiara: Garrard, ca. 1973; worn by Queen Elizabeth II
The Cambridge Lover's Knot Tiara: E. Wolff & Co., ca. 1913; rarely worn
The Canadian Aquamarine Tiara: provenance unknown; worn by the Countess of Wessex
The Cartier Halo Tiara: Cartier, ca. 1936; worn by the Duchess of Cambridge
The Delhi Durbar Tiara: Garrard, ca. 1911; worn by the Duchess of Cornwall
The Festoon Tiara: ca. 1973; worn by Princess Anne
The Girls of Great Britain and Ireland Tiara: E. Wolff & Co., ca. 1893; worn by Queen Elizabeth II
The King George VI Sapphire Tiara: ca. 1963; worn by Queen Elizabeth II
The King George VI Sapphire Tiara: ca. 1963; worn by Queen Elizabeth II
The Maria Feodorovna Sapphire Bandeau Tiara: provenance unknown; rarely worn
The Oriental Circlet Tiara: Garrard, ca. 1853; worn by Queen Elizabeth II
The Papyrus Tiara: Garrard, ca. 1923; worn by the Duchess of Cambridge
The Princess Andrew Meander Tiara: ca. 19th century; worn by Princess Anne
The Queen Alexandra Kokoshnik Tiara: Garrard, ca. 1888; worn by Queen Elizabeth II
The Queen Mary Fringe Tiara: E. Wolff & Co., ca. 1919; worn by Queen Elizabeth II
The Papyrus Tiara: Garrard, ca. 1923; worn by the Duchess of Cambridge
The Princess Andrew Meander Tiara: ca. 19th century; worn by Princess Anne
The Queen Alexandra Kokoshnik Tiara: Garrard, ca. 1888; worn by Queen Elizabeth II
The Queen Mary Fringe Tiara: E. Wolff & Co., ca. 1919; worn by Queen Elizabeth II
The Strathmore Rose Tiara: provenance unknown; rarely worn
The Teck Crescent Tiara: provenance unknown; rarely worn
The Teck Crescent Tiara: provenance unknown; rarely worn
The Vladimir Tiara: ca. 1890; worn by Queen Elizabeth II
The Wessex Wedding Tiara: ca. 1858/1999; worn by the Countess of Wessex
