Adding us as a Preferred Source tells Google you trust our content, so our articles show up more often in your Google Search, Discover feed, and AI Overviews.
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies.
Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style
Black Princeās ruby
gem
Black Princeās ruby, large red gem set in the Maltese cross in the front of the imperial state crown of England. It is not a ruby but is one of the worldās largest gem-quality red spinels, a polished lump 5 cm (2 inches) long, pierced and partly filled with a small ruby. The stone was given to Edward the Black Prince by Pedro the Cruel, king of Castile, on the victory of NĆ”jera in 1367. It narrowly escaped destruction when Henry V wore it at the Battle of Agincourt in 1415.
Discover how ordinary objects work, and expand your understanding of the familiar.
" height="20" alt="HEW Logo">
By clicking "Sign Up", you consent to the Britannica Privacy Policy and Terms of Use.