Not What it Seems: The Black Prince Ruby — The Practical Gemologist
The Imperial State Crown and the Black Prince's Ruby: The stone that is really a spinel and worn by Queen Elizabeth | August birthstone - 9Honey
Royal Rubies - The British Crown Jewels - Purely Diamonds | Purely Diamonds
Black Prince's Ruby - Wikipedia
Französische Kronjuwelen | Orginal Modell der französischen Rubin-Parure von Chaumet | Royal crown jewels, Tiaras jewellery, Royal jewelry
Famous Stones of the British Crown Jewels – Flight To Wonder
George I's state crown in a watercolor by Giuseppe Grisoni, 1718. The Black Prince's Ruby dominates the front. | Royal jewelry, Royal jewels, Royal crowns
Click this image to show the full-size version. | Royal jewels, Royal jewelry, Diamond tiara