The Crown includes several famous jewels. The Cross atop the Crown is set with a stone known as St. Edward's Sapphire, a sapphire taken from the ring (or
possibly coronet) of Edward the Confessor. The Black Prince's Ruby is set on the front cross pattée. Furthermore, the famous Cullinan II, or Lesser Star of
Africa, is set on the front of the Crown. It weighs 530.2 carats and it has an estimated value of over £ 200 million. (information from Wikipidea.org.)