The Golden Jubilee Diamond, a 545.67 carat brown diamond, is the largest cut and faceted diamond in the world. It outweighs the Cullinan I by 15.37 carats. The Golden Jubilee Diamond was discovered in 1985 at the Premier Mine, which is also the origin of the Cullinan diamond (1905) and other notables such as the Taylor–Burton (1966) and the Centenary (1986). Cullinan I, also known as the Great Star of Africa, had held the title of the largest cut and faceted diamond since 1908.

Bhumibol Adulyadej, conferred with the title King Bhumibol the Great, was the ninth king of Thailand from the Chakri dynasty, titled Rama IX, from 1946 until his death in 2016. His reign of 70 years and 126 days is the longest of any Thai monarch, the longest of an independent Asian sovereign and the third longest verified reign of any monarch of a sovereign state in history after Louis XIV and Elizabeth II.