Spinel
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Spinel is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl2O4 in the cubic crystal system. The name comes from the Latin word spinella, a diminutive form
Small spinel crystal on top of a white calcite from Mogok, Myanmar, measuring 1.5 × 1.1 × 1 cm in size
Synthetic spinel made using the hydrothermal method
Black Prince's Ruby
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The Black Prince's Ruby is a large, irregular cabochon red spinel weighing 170 carats set in the cross pattée above the Cullinan II diamond at the front of the Imperial State Crown of the United Kingd
Spinel
…brown, black, or yellow. Chromium(III) causes the red color in spinel from Myanmar. Some spinels are among the most famous gemstones; these include the Black Prince's Ruby and the Timur Ruby in the British Crown Jewels, and the "Côte de Bretagne", formerly from the French Crown jewels. The Samarian Spinel, the largest…
Detail of Queen Victoria's Coronation Portrait, showing the Black Prince's Ruby on the crown