Blue Diamonds owe their intense blue colour to the presence of trace amounts of boron within the crystalline lattice structure, which, when illuminated with ultra-violet light, give off a unique blue glow which is not seen in any other fancy coloured diamonds.
The Transvaal Blue Diamond, a pear cut diamond weighing 25 carats, was found in the Premier Diamond Mine in South Africa. It was initially owned by Baumgold Bros, but its whereabouts today are unknown and remain a mystery.
Other Blue Diamonds
In honour of the founder of the Premier Mine, Sir Thomas Cullinan, in November 2003 the mine was renamed the Cullinan Diamond Mine. It is now known as the Petra Diamond Mine having been acquired in July 2008 by a consortium led by Petra Diamonds. One of the Blue Diamonds found in this mine is the Petra Blue Star of Josephine weighing 7.03 carats and sold in Geneva at the Sotheby’s auction in May 2009 for a record US$9.5 million.
Most of the famous Blue Diamonds were found in this mine. The Premier Blue Diamond is one of its most famous rare stones: it weighs 7.59 carats, is a fancy vivid blue in colour, is internally flawless and has a round, brilliant cut.
Blue diamonds are found in only a few locations in India, South Africa and Australia. The earliest recorded Blue Diamond is the Hope Diamond found in the Kollur Mine in Golconda, India in the 17th Century. Initially named the French Blue Diamond, it was stolen from the French Crown Jewels in 1762 during the French Revolution.
Other famous Blue Diamonds are:
The Blue Heart, sometimes known as the Unzue Diamond, weighing 30.82 carats and cut by Atanik Ekyanan of Neuilly, Paris, in 1909. It was owned for 43 years by an Argentinian woman, Mrs Unzue, who bought it from Cartier’s in 1910. In 1953 it was bought by Van Cleef & Arpels who reset it in a pendant surrounded by 25 white diamonds. It was sold to a European titled family for US$300 000.
The Heart of Eternity from the Premier Mine, a vivid blue diamond, weighing 27.64 carats, cut by the Steinmetz group and now owned by the De Beers Group.
The Wittelsbach-Graff Diamond, found in the Kollur Mine in India, passed through Austrian royalty, after which is was sold at an auction in 2008 to Laurence Graff.
The Sultan of Morocco Diamond, also found in the Kollur Mine, was owned originally by the Yousupov family and Russia, and then passed on to the Sultans in Morocco.
The Zoe Diamond, probably found in South Africa, and weighing 9.75 carats, was sold in 2014 for the highest price ever for any diamond at that time. Originally owned by Rachel ‘Bunny’ Mellon, it was sold at an auction for $32.5 million to Hong Kong billionaire Joseph Lau, for and named after his daughter, Zoe.
The Oppenheimer Blue Diamond from the Premier Mine in South Africa, broke the Zoe Diamond price record when it was sold at an auction in 2016 for $58 million, making it the current record diamond sale price.
Blue Diamonds are excellent investment appreciating options, not only for their beauty, but for their unique value as they are sold at premium prices per carat size.
In 2014 two blue diamonds were found in the Petra Diamond Mine, one weighing 29.62 carats and then another at an incredible 122.52 carats. One can only imagine the investment value of these two blue diamonds.