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They both have aluminium, oxygen, and a little chromium, but spinels also have magnesium, which rubies lack. It was not until 1783 that spinels were chemically differentiated from rubies. The stone is believed to have originated from the Badakhshan mines in present day Afghanistan and Tajikistan, the principal source of large spinel gems in the Middle Ages.Īll red gemstones used to be referred to as rubies or "balas rubies". It has been in the possession of England's rulers since it was given in 1367 to its namesake, Edward of Woodstock (the "Black Prince").
The spinel is one of the oldest parts of the Crown Jewels of the United Kingdom, with a history dating back to the middle of the 14th century. 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. The gemstone at the front of the Imperial State Crown
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