The Golden Jubilee
Weight	545.67 carats (109.13 g)
Color	Yellow-Brown
Cut	Fire Rose Cushion
Country of origin	South Africa
Mine of origin	Premier Mine
Date discovered	1985
Cut by	Gabi Tolkowsky
Original owner	De Beers
Current owner	King Bhumibol Adulyadej of Thailand
Estimated value	Unknown

The Golden Jubilee is currently the largest faceted diamond in the world. Since 1908, Cullinan I, also known as the Great Star of Africa, had held the title, which changed following the 1985 discovery of a large brown diamond of 546 carats (151 g) in the prolific blue ground of the Premier mine in South Africa; the diamond would later be cut and named The Golden Jubilee, with an as-of today unsurpassed weight of 545.67 carats (109.13 g). Image File history File links Goldenjubileediamond. ... The carat is a unit of mass used for gems, and equals 200 milligrams or 3. ... BIC pen cap, about 1 gram. ... Jewelers set diamonds in groups of similar colors. ... In order to best utilize a diamond gemstones superlative material properties, a number of different diamond cuts have been developed. ... The Premier Mine is an underground diamond mine owned by De Beers that is situated in the town of Cullinan, 40 kilometers east of Pretoria, Gauteng Province, South Africa. ... De Beers was founded in South Africa in 1888 and today comprises rough diamond exploration, mining and trading companies. ... Bhumibol Adulyadej (Thai: ; IPA: ; ) (born December 5, 1927), officially styled the Great and also known as Rama IX, is the current King of Thailand. ... A Golden Jubilee is a celebration held to mark a 50th anniversary of a monarchs reign. ... This article is about the gemstone. ... 1908 (MCMVIII) was a leap year starting on Wednesday (link will display the full calendar). ... This article or section does not cite its references or sources. ... 1985 (MCMLXXXV) was a common year starting on Tuesday of the Gregorian calendar. ... The carat is a unit of mass used for gems, and equals 200 milligrams or 3. ... Blue Ground generally refers to a laver of nonoxidized kimberlite. ... The Premier Mine is an underground diamond mine owned by De Beers that is situated in the town of Cullinan, 40 kilometers east of Pretoria, Gauteng Province, South Africa. ...

The Premier mine was also the origin of the Cullinan diamonds in 1905, as well as other notables such as the Taylor-Burton in 1966 and the Centenary in 1986. 1905 (MCMV) was a common year starting on Sunday (link will display the full calendar). ... The Taylor-Burton was a diamond purchased by actor Richard Burton for his wife Elizabeth Taylor to celebrate her fortieth birthday in 1972. ... 1966 (MCMLXVI) was a common year starting on Saturday (the link is to a full 1966 calendar). ... Centenary Diamond Weight 273 carats Color Grade D Colorless Cut Modified Heart Country of origin South Africa Mine of origin Premier Mine Date discovered 11 May 1988 Cut by Mick Harris (DCW) Original owner De Beers Current owner Unknown Estimated value at least USD 100 million The De Beers Centenary... 1986 (MCMLXXXVI) was a common year starting on Wednesday of the Gregorian calendar. ...

The "Unnamed Brown", as the Golden Jubilee was first known, was considered something of an ugly duckling by most. It was given to Gabriel Arellano (DCW) by De Beers for the purpose of testing special tools and cutting methods which had been developed for intended use on the flawless D-colour ("colourless") Centenary. These tools and methods had never been tested before, and the "Unnamed Brown" seemed the perfect guinea pig; it would be of no great loss should something go amiss. De Beers was founded in South Africa in 1888 and today comprises rough diamond exploration, mining and trading companies. ...

To the surprise of all concerned, what resulted was a yellow-brown diamond in a fire rose cushion cut, outweighing Cullinan I by 15.37 carats (3.07 g). The stone remained largely unknown to the outside world, as the Golden Jubilee's sister, the Centenary, had already been selected and promoted to herald De Beer's centennial celebrations in 1988. 1988 (MCMLXXXVIII) was a leap year starting on Friday of the Gregorian calendar. ...

The unnamed diamond had earlier been brought to Thailand by the Thai Diamond Manufacturers Association to be exhibited in the Thai Board of Investment Exhibition in Laem Chabang. There was a mile-long queue to see the diamond, which outshone all other exhibits.

While the current whereabouts of the Centenary are unknown, the Golden Jubilee is known to have been purchased from De Beers by a group led by Henry Ho of Thailand in 1995. The diamond was brought to the late Pope John Paul II in the Vatican to receive the papal blessing. It was also blessed by the Supreme Buddhist Patriarch and the Supreme Imam in Thailand. The Golden Jubilee Diamond was named by King Bhumibol Adulyadej and given to him in honour of his 50th coronation anniversary. It was initially planned to mount the Golden Jubilee in the royal scepter. A subsequent plan was to have it mounted in a royal seal. 1995 (MCMXCV) was a common year starting on Sunday of the Gregorian calendar. ... Bhumibol Adulyadej (Thai: ; IPA: ; ) (born December 5, 1927), officially styled the Great and also known as Rama IX, is the current King of Thailand. ...

The Golden Jubilee Diamond has been exhibited at Henry Ho's 59-story Jewelry Trade Center in Bangkok, the Central Department Store in Lard Prao, Thailand, and internationally in Basel (Switzerland), Borsheims in Omaha, USA (owned by Warren Buffett's Berkshire Hathaway Inc.), and Gleims Jewelers in Palo Alto, USA. It is now located in the Royal Thai Palace as part of the crown jewels. Warren Edward Buffett (born August 30, 1930) is a wealthy American investor and businessman. ... Berkshire Hathaway (NYSE: BRKa) is a company headquartered in Omaha, Nebraska, USA, that oversees and manages a number of subsidiary companies. ...