A ruby jubilee marks a 40th anniversary.
Ruby jubilees in recent history
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| Monarch |
Year of Ruby Jubilee |
| Günther Friedrich Karl II, Prince of Schwarzburg-Sondershausen |
1875 |
| Emperor Pedro II of Brazil |
1881 |
| Frederick Francis II, Grand Duke of Mecklenburg-Schwerin |
1882 |
| Ernest II, Duke of Saxe-Coburg and Gotha |
1884 |
| George Tupou I of Tonga |
1885 |
| George Victor, Prince of Waldeck and Pyrmont |
1885 |
| Franz Joseph I Emperor of Austria & King of Hungary |
1888 |
| Peter II, Grand Duke of Oldenburg |
1893 |
| Charles Alexander, Grand Duke of Saxe-Weimar-Eisenach |
1893 |
| Ernst I, Duke of Saxe-Altenburg |
1893 |
| Johann II of Liechtenstein |
1898 |
| Frederick I, Grand Duke of Baden |
1898 |
| Heinrich XXII, Prince Reuss of Greiz |
1899 |
| Frederick William, Grand Duke of Mecklenburg-Strelitz |
1900 |
| King Norodom of Cambodia |
1901 |
| Emperor Gojong of Korea |
21 Jan 1904 |
| King Carol I of Romania |
10 May 1906 |
| George II, Duke of Saxe-Meiningen |
1906 |
| King Chulalongkorn (Rama V) of Siam |
1908 |
| Emperor Meiji of Japan |
1908 |
| King Alfonso XIII of Spain |
1926[1] |
| Sobhuza II of Swaziland |
1939 |
| King Gustaf V of Sweden |
1947 |
| Sālote Tupou III of Tonga |
1958 |
| Emperor Showa of Japan |
Dec 1966 |
| Franz Joseph II of Liechtenstein |
1978 |
| King Bhumibol Adulyadej (Rama IX) of Thailand |
1986[2] |
| Prince Rainier III of Monaco |
1989 |
| Queen Elizabeth II of the United Kingdom and the other Commonwealth Realms |
6 February 1992[3] |
| King Hussein of Jordan |
11 August 1992 |
| Tāufaʻāhau Tupou IV of Tonga |
16 December 2005 |
| Sultan Hassanal Bolkiah of Brunei |
5 October 2007 |
| Sultan Qaboos bin Said of Oman |
23 July 2010 |
| Queen Margrethe II of Denmark |
14 January 2012[4][5] |
| King Carl XVI Gustaf of Sweden |
15 September 2013[6] |
