The crown includes several famous jewels : the cross at the top 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 ( actually a spinel ) is set on the front cross pattée ; the famous Cullinan II , or Second Star of Africa , is set on the front of the band , replacing , in 1909 , the Stuart Sapphire , which now sits at the back .
The cross at the top 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 ( actually a spinel ) is set on the front cross pattée ; the famous Cullinan II , or Lesser Star of Africa , is set on the front ; and the back band contains the 104 carat Stuart Sapphire .