The Golden Jubilee Diamond - The Largest Diamond in the World ~ Incredipedia

The "Unnamed Brown", as the Golden Jubilee was first known, was considered something of an ugly duckling by most. It is the largest faceted diamond in the world, weighing 545.67 carats (109.13 g).

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 755.5 carats (151 g) in the prolific blue ground of the Premier mine in South Africa. The stone was designed by Gabi Tolkowsky, who also designed the 273.85-carat Centenary Diamond, which is the largest D-Flawless diamond in the world.
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.

The Golden Jubilee got his name when it was presented to the King of Thailand in 1997 for his Golden Jubilee, the 50th anniversary of his coronation. Before this event it was simply Unnamed Brown.

The diamond was brought to 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 famous Golden Jubilee diamond was given to a person named Gabriel Arellano by the De Beers Group. The diamond was given for testing special equipments and cutting methods which was mainly developed for detecting flawless “Centenary diamond”. These sorts of tools and techniques were never tested previously, but it seemed that “The Golden Jubilee” was made guinea pig for this experimentation.

It is now located in the Royal Thai Palace as part of the crown jewels.

Stunningly beautiful it has an estimated value of $4-$12 million.