The Cullinan II diamond, also known as the Second Star of Africa, is a large diamond weighing 317.4 carats. It was cut from the original Cullinan diamond, which was discovered in South Africa in 1905. The diamond is part of the British Crown Jewels and is set in the Imperial State Crown. The Cullinan II is a cushion-cut diamond and is renowned for its clarity and brilliance. It was presented to King Edward VII in 1907 and has since been used in various royal regalia. Its historical significance and stunning appearance make it a notable piece in the collection of royal jewels.