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The gemstone at the front of the Imperial State Crown. The Black Prince's Ruby is a large, irregular cabochon red spinel weighing 170 carats (34 g) set in the cross pattée above the Cullinan II diamond at the front of the Imperial State Crown of the United Kingdom. [1]
The Spinel of the Great Imperial Crown (Russian: Шпинель Большой императорской короны) or Menshikov Ruby [1] (Russian: Рубин Меншикова) is a historical gemstone, a red spinel which tops the Great Imperial Crown of Russia from the 18th century to the present day.
The transparent red spinels were called spinel-rubies [14] or balas rubies. [15] In the past, before the arrival of modern science, spinels and rubies were equally known as rubies. After the 18th century, the word ruby was only used for the red gem variety of the mineral corundum, and the word spinel came to be used. [16] "
The Timur Ruby (also Khiraj-i-alam, "Tribute to the World") is an unfaceted, 352.54-carat (71 g) polished red spinel set in a necklace. [1] It is named after the ruler Timur, [2] founder of the Timurid Empire and purportedly one of its former owners. It was believed to be a ruby until 1851.
In 1956, Speidel introduced men's jewelry. [36] The move was designed to diversify its inventory, and fend off increasingly heavy competition from Japan. Speidel also changed its method to sole distributors, in strategic geographic locations, and built a sales force to cover the United States.
The jewel was commissioned by Duke John the Fearless of Burgundy in the late 1380s, and was one of the most precious treasures of the House of Burgundy. [1] It was created by Parisian goldsmith Herman Ruissel in 1389; the jewel's sale is recorded through a bill dated 11 October and a receipt dated 24 November, both of which are kept in the Côte-d'Or Departmental Archives in Dijon.
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