Cullinan II is a large diamond that weighs 317.4 carats. It is the second-largest gem-quality diamond cut from the Cullinan Diamond, which was discovered in South Africa in 1905. The diamond was named after Sir Thomas Cullinan, the owner of the mine where it was found. After being cut in 1908, Cullinan II was fashioned into a cushion shape and is also known as the Lesser Star of Africa. It is part of the British Crown Jewels and is currently set in the Imperial State Crown, which is used during royal ceremonies.